pcu: Fix TC_egprs_pkt_chan_req_reject_exhaustion

older versions of osmo-pcu were broken and were only allocating TBFs in
the first TRX available. This is now fixed and hence osmo-pcu tries
better to allocate TBFs across different TRX. That's why the test needs
to be fixed to set up only 1 TRX in order to run into the same scenario.

Change-Id: I3f6633950bb89dde3f87a237359497f5b23e0fee
1 file changed