Refactor RecoTrackSelector and RecoTrackRefSelector

[cmsbuild]

This PR refactors the commonalities of RecoTrackSelector and RecoTrackRefSelector to a new base class (RecoTrackSelectorBase; as suggested by a comment in RecoTrackRefSelector). I'm planning to add a third variant (reading tracks through View), and without the refactoring the code would become even more messy. I also took the opportunity to do a similar refactoring of the configuration parameters. I took this separate from the other developments in the hope of smoother integration for purely technical changes.

Tested in CMSSW_7_5_X_2015-06-14-2300, no changes expected in results.

@rovere @VinInn
Automatically ported from CMSSW_7_5_X #9658 (original by @makortel).

[cmsbuild]

A new Pull Request was created by @cmsbuild for CMSSW_7_6_X.

Refactor RecoTrackSelector and RecoTrackRefSelector

It involves the following packages:

CommonTools/RecoAlgos
PhysicsTools/RecoAlgos

@cmsbuild, @cvuosalo, @vadler, @monttj, @slava77 can you please review it and eventually sign? Thanks.
@rappoccio, @jdolen, @makortel, @abbiendi, @mmarionncern, @jhgoh, @ahinzmann, @nhanvtran, @schoef, @mariadalfonso, @TaiSakuma 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: b969345
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-9798/5637/summary.html

[cvuosalo]

+1

For #9798 b969345

Refactoring RecoTrackSelector and RecoTrackRefSelector code. There should be no change in run-time behavior. #9658, the 75X version of this PR, was already approved by Reco.

The code changes are satisfactory, and Jenkins tests against baseline CMSSW_7_6_X_2015-06-23-1100 show no significant differences, as expected.

[davidlange6]

+1

[monttj]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_6_X IBs (tests are also fine). This pull request will be automatically merged.