Transform RecoTrackRefSelector to stream (75X)

[makortel]

Backport of #10911:
This is a minimal change to make RecoTrackRefSelector a stream module (i.e. easily back-portable).

Tested in 7_5_2, no changes expected in results.

@rovere @VinInn @fwyzard

[cmsbuild]

A new Pull Request was created by @makortel (Matti Kortelainen) for CMSSW_7_5_X.

Transform RecoTrackRefSelector to stream (75X)

It involves the following packages:

CommonTools/RecoAlgos

@cmsbuild, @cvuosalo, @slava77 can you please review it and eventually sign? Thanks.
@ahinzmann, @jdolen, @rappoccio, @abbiendi, @jhgoh this is something you requested to watch as well.
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[slava77]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

-1
Tested at: c97fe8e
When I ran the RelVals I found an error in the following worklfows:
4.22 step1

DAS Error

you can see the results of the tests here:
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10912/7576/summary.html

[fwyzard]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: c97fe8e
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10912/7593/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10912/7593/summary.html

[cvuosalo]

+1

For #10912 c97fe8e

Making RecoTrackRefSelector a stream module. There should be no change in monitored quantities. This PR is a backport of a part of #10911 (76X); the latter has already been approved by Reco.

The code changes are satisfactory, and Jenkins tests against baseline CMSSW_7_5_X_2015-08-24-1100 show no significant differences, as expected.

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_5_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

[fwyzard]

track this at #10965