TC_sabm_retransmit BTS_Tests_LAPDm

Regression

Failing for the past 1 build since #2734

Took 40 sec (from Titan)

Stack Trace

FBSB Failed with non-zero return code 255
      BTS_Tests_LAPDm.ttcn:1467 BTS_Tests_LAPDm control part
      BTS_Tests_LAPDm.ttcn:219 TC_sabm_retransmit testcase