fix to fill properly the rec-hits Tracker maps 81X

[fioriNTU]

This PR fix the filling of Tracker Maps relative to rec-hits, they where filled with the hit number normalized for the number of tracks, while what we want is the mean per event.

[cmsbuild]

A new Pull Request was created by @fioriNTU for CMSSW_8_1_X.

It involves the following packages:

DQM/SiStripMonitorTrack

@cmsbuild, @vanbesien, @deguio, @davidlange6 can you please review it and eventually sign? Thanks.
@threus this is something you requested to watch as well.
@slava77, @Degano, @smuzaffar you are the release manager for this.

cms-bot commands are list here #13028

[deguio]

please test

[deguio]

+1

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/12818/console

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_1_X IBs after it passes the integration tests. This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar

[cmsbuild]

+1
Tested at: e713496
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-14217/12818/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-14217/12818/summary.html

[davidlange6]

@fioriNTU -please give this PR a descriptive title for the release notes. Thanks!

[davidlange6]

+1