TC_removeMapping_connected RemsimBankd_Tests

Failing for the past 8 builds since #670

Took 21 sec (from Titan)

Stack Trace

Timeout expecting disconnect
      RemsimBankd_Tests.ttcn:445 RemsimBankd_Tests control part
      RemsimBankd_Tests.ttcn:362 TC_removeMapping_connected testcase