MuonAnalysis/MuonAssociators: getByToken in TriggerObjectFilterByCollection

[gpetruc]

Trivial getByToken migration in this selector.
The module is not run in production, so it probably was missed in the migrations, but is run in analysis as part of the muon tag&probe.

[cmsbuild]

A new Pull Request was created by @gpetruc (Giovanni Petrucciani) for CMSSW_7_6_X.

MuonAnalysis/MuonAssociators: getByToken in TriggerObjectFilterByCollection

It involves the following packages:

MuonAnalysis/MuonAssociators

@cmsbuild, @vadler, @monttj can you please review it and eventually sign? Thanks.
@bellan, @abbiendi, @trocino, @jhgoh, @battibass 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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