Keep all TriggerResults in MiniAOD event content (75X)

[gpetruc]

Keep all TriggerResults, to be sure we will have the one containing the MET filters whatever CMSSW process name is used to run MiniAOD.
A better solution would be to keep only the one of the current process (plus the HLT one), but that would require a bit more study to make sure the configuration ends up correct in all workflows.
( cherry-pick of #10022 into 74X )

[cmsbuild]

A new Pull Request was created by @gpetruc (Giovanni Petrucciani) for CMSSW_7_5_X.

Keep all TriggerResults in MiniAOD event content (75X)

It involves the following packages:

PhysicsTools/PatAlgos

@cmsbuild, @vadler, @monttj can you please review it and eventually sign? Thanks.
@rappoccio, @imarches, @ahinzmann, @acaudron, @mmarionncern, @jdolen, @nhanvtran, @schoef, @ferencek, @mariadalfonso, @pvmulder, @TaiSakuma 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.
You can reject by replying to this message having '-1' in the first line of your reply.
If you are a L2 or a release manager you can ask for tests by saying 'please test' in the first line of a comment.
@Degano you are the release manager for this.
You can merge this pull request by typing 'merge' in the first line of your comment.