Remove PixelTracksForL3Isolation configurations and IsolationRegionAroundL3Muon as obsolete

[makortel]

While migrating PixelTrackProducer to the new seeding framework (from #16635), I encountered *TracksForL3Isolation_cf*.py set of configuration files and IsolationRegionAroundL3Muon TrackingRegionProducer that seem to be currently unused. I'm asking if they are obsolete and can be removed, or still need to be maintained? (I'm more interested in the configs than the region producer). The files were confirmed to be obsolete (see message below #16863 (comment)).

The commit shows the exact set of files.

Tested in CMSSW_9_0_X_2016-12-02-1100, no changes expected.

@slava77 @cvuosalo @rovere @VinInn @mtosi

[cmsbuild]

A new Pull Request was created by @makortel (Matti Kortelainen) for CMSSW_9_0_X.

It involves the following packages:

RecoMuon/L3MuonIsolationProducer

@cmsbuild, @cvuosalo, @slava77, @davidlange6 can you please review it and eventually sign? Thanks.
@bellan, @abbiendi, @jhgoh, @calderona, @HuguesBrun, @battibass, @trocino, @bachtis, @rociovilar this is something you requested to watch as well.
@slava77, @smuzaffar you are the release manager for this.

cms-bot commands are listed here #13028

[makortel]

@cmsbuild, please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/16775/console

[cmsbuild]

+1
Tested at: de47aa4
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-16863/16775/summary.html

[cmsbuild]

Comparison job queued.

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-16863/16775/summary.html

The workflows 1003.0, 1001.0, 1000.0, 140.53, 136.731, 4.22 have different files in step1_dasquery.log than the ones found in the baseline. You may want to check and retrigger the tests if necessary. You can check it in the "files" directory in the results of the comparisons

[slava77]

@jhgoh, @calderona, @HuguesBrun, @battibass please confirm that it's OK to remove these muon HLT modules

[HuguesBrun]

Hello @slava77 ,
After double check with the muon HLT conveners (@sarafiorendi and @BenjaminRS) we confirm that this code is not used anymore in muon reconstruction at HLT. It was used in run 1 but we switched to the regional iterative tracking so we do not see any reason for maintaining this piece of code

[makortel]

@HuguesBrun @sarafiorendi @BenjaminRS Thanks for the confirmation, I'll modify the PR title and description accordingly.

[slava77]

+1

for #16863 de47aa4

• removal of obsolete code (not present in tested workflows)
• jenkins tests pass

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_9_0_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @smuzaffar

[davidlange6]

+1