Updated defaut PAT jet b-taggers

[ferencek]

Now that CMSSW_7_4_0_pre8 RelVals are available, the list of default PAT jet b-taggers has been updated. This PR completes the changes introduced in #7542, #7678, and #7732.

[cmsbuild]

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

Updated defaut PAT jet b-taggers

It involves the following packages:

PhysicsTools/PatAlgos
RecoBTag/SecondaryVertex
TopQuarkAnalysis/Configuration

@nclopezo, @cvuosalo, @monttj, @cmsbuild, @slava77, @vadler can you please review it and eventually sign? Thanks.
@rappoccio, @imarches, @ahinzmann, @acaudron, @mmarionncern, @nhanvtran, @schoef, @ferencek, @mariadalfonso, @pvmulder, @TaiSakuma this is something you requested to watch as well.
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[cvuosalo]

@cmsbuild please test

[cmsbuild]

The tests are being triggered in jenkins.

[cmsbuild]

+1
Tested at: 91190e7
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7992/2981/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-7992/2981/summary.html

[cvuosalo]

+1

For [#7992] 91190e7

This PR makes a tiny change to Reco code to change an unnecessary copying of a vector to a const reference instead, and also alters Analysis code to update the list of default PAT b-jet taggers and RelVal input.

For Reco:

The code changes are satisfactory.

Jenkins tests CMSSW_7_4_X_2015-02-27-0200:
compilation, unit tests, matrix tests, static checks are all OK.

As expected, there are no significant differences compared to the baseline in the
following:

alternative-comparisons
(after stripping false positives like timer data)

and

validateJR