Implemented unpacking all PVs instead of just the leading one: 74X

[ferencek]

Backport of #9903.

[cmsbuild]

A new Pull Request was created by @ferencek (Dinko Ferencek) for CMSSW_7_4_X.

Implemented unpacking all PVs instead of just the leading one: 74X

It involves the following packages:

PhysicsTools/PatAlgos

@cmsbuild, @vadler, @monttj can you please review it and eventually sign? Thanks.
@rappoccio, @imarches, @ahinzmann, @acaudron, @mmarionncern, @jdolen, @nhanvtran, @schoef, @ferencek, @gpetruc, @mariadalfonso, @pvmulder, @TaiSakuma this is something you requested to watch as well.
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[monttj]

please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 66b0b16
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9926/6087/summary.html

[monttj]

+1
This is backport of #9903

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_4_X IBs once checked with relvals in the development release cycle of CMSSW (tests are also fine). This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1