GenParticles2HepMCConverter Consumes migration

[jhgoh]

GenParticles2HepMCConverter in GeneratorInterface/RivetInterface have not been migrated to use getByToken.
This PR is simple migration to the MT friendly framework modules.

No physics change is expected.

[cmsbuild]

A new Pull Request was created by @jhgoh (Junghwan John Goh) for CMSSW_7_6_X.

GenParticles2HepMCConverter Consumes migration

It involves the following packages:

GeneratorInterface/RivetInterface

@vciulli, @cmsbuild, @covarell, @bendavid, @thuer can you please review it and eventually sign? Thanks.
@mkirsano this is something you requested to watch as well.
You can sign-off by replying to this message having '+1' in the first line of your reply.
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@Degano you are the release manager for this.
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[bendavid]

+1

[cmsbuild]

This pull request is fully signed and it will be integrated in one of the next CMSSW_7_6_X IBs or unless it breaks tests. This pull request requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[cmsbuild]

+1
Tested at: ccada79
https://cmssdt.cern.ch/SDT/jenkins-artifacts/pull-request-integration/PR-10311/6426/summary.html

[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 requires discussion in the ORP meeting before it's merged. @davidlange6, @Degano, @smuzaffar

[davidlange6]

+1