Make the L1REPACK step work with the Run 2 eras

[mark-grimes]

This PR is mainly to make the L1REPACK step work with the Run 2 eras. In doing so I've rearranged the era configuration slightly to make it a little more modular. Files import one new cff file, all of the commands in which are conditional on the stage1L1Trigger era being active. Hence it is always safe to import whether the Stage 1 trigger is being used or not. This simplifies the higher level config files, and should hopefully make them more intuitive.

If trigger experts have suggestions of a better arrangement please feel free to comment.

I've run diffs of the config files for the following workflows, and there are no differences:

1000.0,1001.0,1003.0,101.0,1306.0,1306.0,1330.0,135.1,135.4,140.53,25.0,25.0,250203.0,25202.0,25203.0,4.22,4.52,4.53,5.1,500203.0,50202.0,50203.0,8.0,9.0

@Martin-Grunewald - Once this is merged the AddOn tests will work with eras (I've checked) and I'll reopen #11690.

[cmsbuild]

A new Pull Request was created by @mark-grimes (Mark Grimes) for CMSSW_7_6_X.

Make the L1REPACK step work with the Run 2 eras

It involves the following packages:

Configuration/StandardSequences
FastSimulation/Configuration
L1Trigger/Configuration

@ssekmen, @lveldere, @civanch, @mdhildreth, @cmsbuild, @franzoni, @mulhearn, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig, @makortel, @GiacomoSguazzoni, @rovere, @VinInn, @Martin-Grunewald, @matt-komm, @cerati, @dgulhan this is something you requested to watch as well.
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[Martin-Grunewald]

please test

[cmsbuild]

The tests are being triggered in jenkins.
https://cmssdt.cern.ch/jenkins/job/ib-any-integration/8907/console

[cmsbuild]

+1
Tested at: ef8cf18
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11817/8907/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-11817/8907/summary.html

[mulhearn]

+1