Remove python and py2-future

[smuzaffar]

This is backport of #7359 (from DEVEL IBs) which remove python2 and python2 based packages
backport of #7359

[cmsbuild]

A new Pull Request was created by @smuzaffar (Malik Shahzad Muzaffar) for branch IB/CMSSW_12_3_X/master.

@cmsbuild, @smuzaffar, @iarspider, @ddaina can you please review it and eventually sign? Thanks.
@perrotta, @dpiparo, @qliphy you are the release manager for this.
cms-bot commands are listed here

[smuzaffar]

please test

[cmsbuild]

+1

Summary: https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8c06b9/21044/summary.html
COMMIT: 3317585
CMSSW: CMSSW_12_3_X_2021-12-06-2300/slc7_amd64_gcc900
User test area: For local testing, you can use /cvmfs/cms-ci.cern.ch/week0/cms-sw/cmsdist/7492/21044/install.sh to create a dev area with all the needed externals and cmssw changes.

The following merge commits were also included on top of IB + this PR after doing git cms-merge-topic:

• @vkuznet New version of tools #7487
• @cms-sw Update python-ldap 3.4.0 #7489

You can see more details here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8c06b9/21044/git-recent-commits.json
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-8c06b9/21044/git-merge-result

Comparison Summary

Summary:

• No significant changes to the logs found
• Reco comparison results: 4 differences found in the comparisons
• DQMHistoTests: Total files compared: 42
• DQMHistoTests: Total histograms compared: 3250608
• DQMHistoTests: Total failures: 6
• DQMHistoTests: Total nulls: 0
• DQMHistoTests: Total successes: 3250580
• DQMHistoTests: Total skipped: 22
• DQMHistoTests: Total Missing objects: 0
• DQMHistoSizes: Histogram memory added: 0.0 KiB( 41 files compared)
• Checked 177 log files, 37 edm output root files, 42 DQM output files
• TriggerResults: no differences found

[smuzaffar]

+externals
@qliphy , @perrotta @makortel , this pr drops python2 and last py2 back package from 12.3.X release. This has been in devel IBs for couple of months. Feel free to merge it.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next IB/CMSSW_12_3_X/master IBs (tests are also fine). This pull request will now be reviewed by the release team before it's merged. @perrotta, @dpiparo, @qliphy (and backports should be raised in the release meeting by the corresponding L2)

[perrotta]

+1

• The beginning of the 12_3_X cycle is the right moment to merge this

[davidlange6]

hi @smuzaffar - the IB of last night has some warnings due to this change

****WARNING: Invalid tool python. Please fix das_client file.
****WARNING: Invalid tool python. Please fix frontier_client file.

[smuzaffar]

thanks @davidlange6 , #7501 should fix this.