Get rid of relative imports.

[ericvaandering]

Python 3 will not allow them. Correct them all to use absolute imports

[cmsbuild]

A new Pull Request was created by @ericvaandering (Eric Vaandering) for CMSSW_8_0_X.

Get rid of relative imports.

It involves the following packages:

CondCore/TagCollection
FWCore/GuiBrowsers
PhysicsTools/PythonAnalysis
Utilities/RelMon
Utilities/ReleaseScripts

@smuzaffar, @diguida, @cvuosalo, @cerminar, @monttj, @cmsbuild, @franzoni, @Dr15Jones, @slava77, @vadler, @mmusich can you please review it and eventually sign? Thanks.
@ghellwig, @apfeiffer1, @wmtan, @ahinzmann, @wddgit, @Martin-Grunewald this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
You can reject by replying to this message having '-1' in the first line of your reply.
If you are a L2 or a release manager you can ask for tests by saying 'please test' in the first line of a comment.
@Degano you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.

[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/9100/console

[Dr15Jones]

+1

[cmsbuild]

+1
Tested at: 3bb4f98
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12016/9100/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12016/9100/summary.html

[slava77]

+1

for #12016 3bb4f98

• technical change is applied as described (only +60 −35 lines changed in 25 files after whitespaces are ignored)
• jenkins tests pass and comparisons with baseline show no differences