TC_rec_invalid_frame BTS_Tests_LAPDm

Regression

Failing for the past 1 build since #3104

Took 11 sec (from Titan)

Stack Trace

"BTS_Tests_LAPDm.ttcn:899 : Missing LAPDm_RR RSP"
      BTS_Tests_LAPDm.ttcn:1488 BTS_Tests_LAPDm control part
      BTS_Tests_LAPDm.ttcn:961 TC_rec_invalid_frame testcase