bsc: test TSC in various messages

In a recent osmo-bsc patch:

"allow explixit TSC Set and TSC on chan activ / modif / assignment"
c33eb8d56943b8981523754b081967e6ff5f245d
Ic665125255d7354f5499d10dda1dd866ab243d24

I accidentally changed the default behavior of the Training Sequence
Code sent to BTS and MS. So now, make sure that we verify the expected
Training Sequence Code in BSC_Tests, in:

RSL Channel Activate
RR Immediate Assignment
RR Assignment Command
RR Channel Mode Modify
RSL Mode Modify

Related: OS#5172 SYS#5315
Change-Id: Id67a949e0f61ec8123976eb8d336f04510c55c01
3 files changed