stp: m3ua: Expect unsolicited ASPIA ACK after unblocking ASP
Since libosmo-sigtran.git Change-Id If32902575e874d2acc9a5fc12509af42ed151739, osmo-stp will send an unsolicited ASPIA ACK to the peer whenever the ASP becomes unblock, in order to somehow give a chance to the peer to notice something changed and for instance possibly attempt re-activation of the ASP.
The test failed sporadically with: "RAN_Emulation.ttcnpp:600 Dynamic test case error: Sending data on the connection of port BSSAP to 659:SCCP_SP_PORT failed. (Broken pipe)"
That's because it was simply waiting for a fixed amount of time while letting the underlaying RAN_Emulation do the RESET procedure. Sometimes it started tearing down the test before the procedure was fully completed, and RAN_Emulation failed passing the Reset (ACK) up the stack because the component was already unmapped.
Fix the issue by making sure the RAN_Emulation finished the RESET procedure before stopping the testThe test.
