Add eras for 2016 and Run 1 (76X)

[mark-grimes]

As requested this is a back port of #12023 for 7_6_X. There was some discussion on there about changing era names, but then it was merged so I assume everything is okay. If not please comment here.

The description for #12023 copied here for completeness:
This adds a Run2_2016 era that uses the stage 2 trigger. The stage2L1Trigger sub-era component of it is currently empty, but I'm expecting trigger experts to apply the correct commands.

A Run1 era is also added. This is foreseen as a no-operation era to help with scripting cmsDriver commands (e.g. --era=$MY_ERA). However, it also adds the flexibility to add customisation changes at a later date.

Both of these additions were discussed in the 20/Oct/2015 release planning meeting.

[cmsbuild]

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

Add eras for 2016 and Run 1 (76X)

It involves the following packages:

Configuration/StandardSequences

@cmsbuild, @franzoni, @davidlange6 can you please review it and eventually sign? Thanks.
@ghellwig, @makortel, @GiacomoSguazzoni, @rovere, @VinInn, @Martin-Grunewald, @cerati, @dgulhan this is something you requested to watch as well.
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@Degano you are the release manager for this.
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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/9231/console

[cmsbuild]

+1
Tested at: 98c3eb4
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12117/9231/summary.html

[cmsbuild]

Comparison is ready
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-12117/9231/summary.html

[davidlange6]

+1