robot test case and possibly BBSIM extension to test OnuAdapter reconcilement with MDS mismatch

It would be good to have a robot test also for this critical situation:
TT scenario with multiple ONU's and multiple (4?) UNI's per ONU, ONU adapter reconcilement from flow-pushed state, but with ensuring mis-matching (faked) MDS counter on the ONU (BBSIM only?) , verification of usual system states afterwards and ONU connection state (if done on BBSIM of course as far as BBSIM supports such [data plane] tests)
(could possibly also be extended with extra disable/enable ONU test during reconcilement)
If BBSIM is used it must be extended to support some config option that during run time invalidates the actual MDS (if that is problematic perhaps also as initial setting).
Test case could be used for manual testing, decision on integration into some pipeline pending.

Robot test case itself could be similar to what is done here: https://jenkins.opencord.org/view/VOLTHA-2.X-Tests/job/periodic-voltha-multi-uni-multiple-olts-test-bbsim/