Update edmLumisInFiles.py to python3

[sanuvarghese]

The issue is regarding an error when running edmLumisInFiles.py file.root command in CMSSW_12_3_0_pre5 (or any 12_X) , I am getting the error:

Traceback (most recent call last):
  File "/cvmfs/cms.cern.ch/slc7_amd64_gcc10/cms/cmssw/CMSSW_12_3_0_pre5/bin/slc7_amd64_gcc10/edmLumisInFiles.py", line 4, in <module>
    from FWCore.PythonUtilities.LumiList   import LumiList
ImportError: No module named FWCore.PythonUtilities.LumiList

The error seems to be a python3 vs python2 problem. I was able to run the same command in 10_6_X without error.

[cmsbuild]

A new Issue was created by @sanuvarghese Sanu Varghese.

@Dr15Jones, @perrotta, @dpiparo, @makortel, @smuzaffar, @qliphy can you please review it and eventually sign/assign? Thanks.

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[makortel]

assign core

[cmsbuild]

New categories assigned: core

@Dr15Jones,@smuzaffar,@makortel you have been requested to review this Pull request/Issue and eventually sign? Thanks

[makortel]

This has been fixed already in #37107 (that was merged in CMSSW_12_3_X_2022-03-02-1100). @sanuvarghese Are you in need of a backport, or is this sufficient (it will be in 12_3_0_pre6 that should get built soon).

[sanuvarghese]

No this is sufficient.

[makortel]

+core

[cmsbuild]

This issue is fully signed and ready to be closed.