Multi run harvesting for 8 0 x

[dimattia]

Greetings,

this PR implements the correct setting of the IOV of the gain calibration payload produced with the multi run harvesting procedure in PCL. Currently the IOV is set to the "oldest" run analyzed in the harvesting step.

It also include a fix delivered by Marco Musich in #14949

[cmsbuild]

A new Pull Request was created by @dimattia for CMSSW_8_0_X.

It involves the following packages:

CalibTracker/SiStripChannelGain
Calibration/TkAlCaRecoProducers
CommonTools/ConditionDBWriter

@ghellwig, @cerminar, @cmsbuild, @franzoni, @ggovi, @mmusich, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig, @jlagram, @threus, @gbenelli, @tocheng 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

[mmusich]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/13649/console

[cmsbuild]

+1
Tested at: 6fb4cee
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-14965/13649/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-14965/13649/summary.html

[mmusich]

+1

[ggovi]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_8_0_X IBs (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @slava77, @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1