UBUNTU: [Documentation] Justification for removal of UBUNTU commits

This is an empty commit for documentation purposes only.

Historically, some old and unused firmware was removed by directly purging
the firmware files from the repo with UBUNTU commits or by reverting the
relevant upstream commits. Subsequent UBUNTU commits cleaned up the WHENCE
file and removed stale entries so that the check-whence.py checker is
happy.

Recent changes introduced the concept of listing firmware files, that
should not be packaged, in a separate file debian/remove-firmware.list.
These changes also included the reverting of the above mentioned commits
and the addition of the 'removed' firmware files to remove-firmware.list so
that the resulting package content doesn't change.

With that, we ended up with 5 commits per firmware removal set:
  1) The original firmware removal commit
  2) The subsequent WHENCE fixup
  3) The revert of #2
  4) The revert of #1
  5) The addition of the 'removed' firmware files to remove-firmware.list

This is not ideal since a) upstream files are modified (WHENCE) and deleted
for the sole purpose of not packaging them and b) because of that,
subsequent rebases to latest upstream could result in conflicts.

For these reasons, it was decided to alter the history of this branch and
remove commits #1 to #4 and only keep #5. Note that some of the #1 commits
unfortunately touched both upstream and UBUNTU files. Only the
modifications of upstream files was removed, the UBUNTU modifications
needed to be kept.

Both branch commits (before and after the rebase and removal of commits)
are tagged and it was verified, that the repo content at these tags is
identical (except for debian/changelog). More specifically, the 'before'
tag is:
  Ubuntu-20220217.git6342082c-0ubuntu2
and the 'after' tag is:
  Ubuntu-20220217.git6342082c-0ubuntu3

$ git diff --name-only Ubuntu-20220217.git6342082c-0ubuntu2 Ubuntu-20220217.git6342082c-0ubuntu3
debian/changelog

Removed #1 commits:

563bb48ed143 ("UBUNTU: Remove amd64-microcode")
251237583bdd ("UBUNTU: Revert "linux-firmware: Add firmware files for Siano DTV devices"")
513a97a03fba ("UBUNTU: Remove obsolete bnx2x firmware files")
935dc770957e ("UBUNTU: Remove obsolete tr_smctr firmware")
1be4f28f91fb ("UBUNTU: Remove obsolete ti-connectivity firmware")
3d183a325fec ("UBUNTU: Remove obsolete tda1004x firmware")
09e02976b05b ("UBUNTU: Remove obsolete sxg firmware")
9b6d6bbcbc18 ("UBUNTU: Remove obsolete myricom firmware")
bfa2ac04ade6 ("UBUNTU: Remove obsolete mwl8k firmware")
a46068ae4580 ("UBUNTU: Remove obsolete libertas firmware")
1faeeb10de57 ("UBUNTU: Remove obsolete Computone firmware")
22f2239919d9 ("UBUNTU: Remove obsolete dabusb firmware")
03310ea1e1e7 ("UBUNTU: Remove obsolete cxgb firmware")
064c4d3944e4 ("UBUNTU: Remove obsolete bnx2x firmware")
4ce08856dee0 ("UBUNTU: Remove obsolete ar9170 firmware")
c5a7aadccbfd ("UBUNTU: Remove obsolete ar7010 firmware")
f11a59536386 ("UBUNTU: Remove obsolete ath3k firmware")
2188b4baf819 ("UBUNTU: Remove obsolete 3com firmware")
0470cfcec635 ("UBUNT: Remove obsolete ath6k firmware")
e55ef4edc755 ("UBUNTU: Remove obsolete slicoss firmware")
0563995d173f ("UBUNTU: Remove obsolete ath9k firmware")
85ee46eb9136 ("UBUNTU: Remove obsolete ar3k firmware")
4f7cf7c3ecd1 ("UBUNTU: Remove obsolete bnx2x firmware files")
634d7ba9a08a ("UBUNTU: Remove obsolete iwlwifi ucode files")
ee2de66a5c8e ("UBUNTU: Drop obsolete cxgb3 firmware")
6a312e01f665 ("UBUNTU: Remove obsolete ueagle-atm firmware")

Removed #2 commits:

6364dccf3cf6 ("UBUNTU: SAUCE: Remove obsolete ueagle-atm from WHENCE")
0ee3db9fc288 ("UBUNTU: SAUCE: Remove obsolete cxgb3 from WHENCE")
b5b56ccff00e ("UBUNTU: SAUCE: Remove obsolete files from WHENCE")
a627a307ae5d ("UBUNTU: SAUCE: Remove obsolete bnx2x from WHENCE")
0398c63ad4d5 ("UBUNTU: SAUCE: Remove obsolete ar3k from WHENCE")
fe771637f2fb ("UBUNTU: SAUCE: Remove obsolete ath9k from WHENCE")
67bde05fdf67 ("UBUNTU: SAUCE: Remove obsolete slicoss from WHENCE")
bf1184377246 ("UBUNTU: SAUCE: Remove obsolete ath6k from WHENCE")
554e29696398 ("UBUNTU: SAUCE: Remove obsolete 3com from WHENCE")
e89cc56af2a8 ("UBUNTU: SAUCE: Remove obsolete ath3k from WHENCE")
19f93a469a30 ("UBUNTU: SAUCE: Remove obsolete ar7010 from WHENCE")
f7512d3ddbf2 ("UBUNTU: SAUCE: Remove obsolete ar9170 from WHENCE")
5374033d6cf9 ("UBUNTU: SAUCE: Remove obsolete bnx2x from WHENCE")
7cb7df9d1b4c ("UBUNTU: SAUCE: Remove obsolete cxgb from WHENCE")
c2f8f6087c71 ("UBUNTU: SAUCE: Remove obsolete dabusb from WHENCE")
a3b4bfb6350c ("UBUNTU: SAUCE: Remove obsolete Computone from WHENCE")
0b25767b762e ("UBUNTU: SAUCE: Remove obsolete libertas from WHENCE")
9f505e5b38df ("UBUNTU: SAUCE: Remove obsolete mwl8k from WHENCE")
e134bb085a93 ("UBUNTU: SAUCE: Remove obsolete myricom from WHENCE")
c9d47ad1bb5c ("UBUNTU: SAUCE: Remove obsolete sxg from WHENCE")
69898586dda3 ("UBUNTU: SAUCE: Remove obsolete tda7706 from WHENCE")
e0c45aa236cb ("UBUNTU: SAUCE: Remove obsolete ti-connectivity from WHENCE")
c34fd0ed78aa ("UBUNTU: SAUCE: Remove obsolete tr_smctr from WHENCE")
df2becc5ae36 ("UBUNTU: SAUCE: Remove obsolete bnx2x from WHENCE")

Removed #3 commits:

f25df0ab5d6d ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete bnx2x from WHENCE"")
4685558a4306 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete tr_smctr from WHENCE"")
70de9f30507c ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete ti-connectivity from WHENCE"")
bfa02d2d78a9 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete tda7706 from WHENCE"")
8602072bdc09 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete sxg from WHENCE"")
1664c8e4d112 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete myricom from WHENCE"")
ffe2b36ab183 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete mwl8k from WHENCE"")
508a753ad4c6 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete libertas from WHENCE"")
5bc8c64aff3f ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete Computone from WHENCE"")
ca1e98863330 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete dabusb from WHENCE"")
1945d6ce8444 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete cxgb from WHENCE"")
e04f6f209c3c ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete bnx2x from WHENCE"")
501fa54d2536 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete ar9170 from WHENCE"")
afb50e6a581b ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete ar7010 from WHENCE"")
44ddba93c32c ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete ath3k from WHENCE"")
8436648da231 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete 3com from WHENCE"")
2f1d2d02682e ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete ath6k from WHENCE"")
a44e92ce40cd ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete slicoss from WHENCE"")
a32264fb18e1 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete ath9k from WHENCE"")
363cee77ee86 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete ar3k from WHENCE"")
e1a84a4030ed ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete bnx2x from WHENCE"")
9ea39053a338 ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete files from WHENCE"")
c7cc420416ee ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete cxgb3 from WHENCE"")
87b90b7c960d ("UBUNTU: SAUCE: Revert "UBUNTU: SAUCE: Remove obsolete ueagle-atm from WHENCE"")

Removed #4 commits:

ccc1fe51b7a8 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove amd64-microcode"")
b414629bc096 ("UBUNTU: SAUCE: Revert "UBUNTU: Revert "linux-firmware: Add firmware files for Siano DTV devices""")
e49792d86191 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete bnx2x firmware files"")
85e465fe789e ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete tr_smctr firmware"")
98a9f407adf8 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete ti-connectivity firmware"")
cd3774f837d1 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete tda1004x firmware"")
8a3b516d3e19 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete sxg firmware"")
fe5d0c811d2b ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete myricom firmware"")
ef6bd3107d68 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete mwl8k firmware"")
c8efb5b021ef ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete libertas firmware"")
98d8fc5449ea ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete Computone firmware"")
fd9d93689df4 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete dabusb firmware"")
65c6ff98909f ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete cxgb firmware"")
f13124a09e4d ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete bnx2x firmware"")
176127bd41dd ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete ar9170 firmware"")
158bb95bad45 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete ar7010 firmware"")
898ffa58b927 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete ath3k firmware"")
be2094113362 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete 3com firmware"")
cd64bbc67264 ("UBUNTU: SAUCE: Revert "UBUNT: Remove obsolete ath6k firmware"")
3748946211c8 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete slicoss firmware"")
5ca659c4e7d8 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete ath9k firmware"")
4810ffeb8be9 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete ar3k firmware"")
c460239b267e ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete bnx2x firmware files"")
9f64056d66ea ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete iwlwifi ucode files"")
9446e4477c8c ("UBUNTU: SAUCE: Revert "UBUNTU: Drop obsolete cxgb3 firmware"")
eff4f433b3b4 ("UBUNTU: SAUCE: Revert "UBUNTU: Remove obsolete ueagle-atm firmware"")

Signed-off-by: Juerg Haefliger <juergh@canonical.com>