Change /usr/local to RW

[ipetrov117]

Current behaviour:

example-libvirt:~ # touch /usr/local/rw-test
touch: cannot touch '/usr/local/rw-test': Read-only file system
example-libvirt:~ # btrfs subvolume list /
ID 256 gen 18 top level 5 path @
ID 257 gen 30 top level 256 path @/var
ID 258 gen 29 top level 256 path @/root
ID 259 gen 25 top level 256 path @/opt
ID 260 gen 25 top level 256 path @/srv
ID 261 gen 25 top level 256 path @/home
ID 262 gen 25 top level 256 path @/.snapshots
ID 263 gen 22 top level 262 path @/.snapshots/1/snapshot
ID 264 gen 29 top level 263 path etc
ID 265 gen 18 top level 264 path etc/.snapshots
ID 266 gen 13 top level 265 path etc/.snapshots/1/snapshot
ID 267 gen 17 top level 265 path etc/.snapshots/2/snapshot

With suggested changes:

example-libvirt:~ # touch /usr/local/rw-test
example-libvirt:~ # btrfs subvolume list /
ID 256 gen 18 top level 5 path @
ID 257 gen 45 top level 256 path @/var
ID 258 gen 25 top level 256 path @/root
ID 259 gen 25 top level 256 path @/opt
ID 260 gen 25 top level 256 path @/srv
ID 261 gen 25 top level 256 path @/home
ID 262 gen 25 top level 256 path @/usr/local
ID 263 gen 37 top level 256 path @/.snapshots
ID 264 gen 22 top level 263 path @/.snapshots/1/snapshot
ID 265 gen 34 top level 264 path etc
ID 266 gen 36 top level 265 path etc/.snapshots
ID 267 gen 13 top level 266 path etc/.snapshots/1/snapshot
ID 268 gen 17 top level 266 path etc/.snapshots/2/snapshot
ID 269 gen 30 top level 266 path etc/.snapshots/3/snapshot

Tested with elemental3 customize for both RAW and ISO images.

[atanasdinov]

Thanks!!