Improve pickEvmTrig to work with multi-Trio per FM

[kakwok]

pickEvmTrig assumes one TA per FM, otherwise it could pick the set of TA/Evb/FU instance from different executives.
Relaxing this constrain make crate masking possible

https://github.com/HCALRunControl/levelOneHCALFM/blob/master/src/rcms/fm/app/level1/HCALMasker.java#L81

[jhakala]

We should think about whether a multi-trio solution for crate masking could also be accomplished using the networkTA/localDAQFM scheme. It would be useless to implement this if we still plan to pursue the localDAQFM milestone.

[jhakala]

Related issue:
https://gitlab.cern.ch/cmshcos/hcal/issues/107

I'm hoping that we could find a simpler solution: the trio currently has to live in the same executive as a special DTCReadout. I understand that this is basically because of the DummyTriggerAdapter code's assumptions, but that it has nearly been fixed by Seth's work on the Network(TCDS) mode, though there are still problems. If those problems get fixed, then only a single TA per partition would be required, bypassing this issue.