BTS_Tests: workaround addr='0.0.0.0' in f_rtpem_activate()

If a CRXC message contains optional remote IP and port IEs, the
CRCX ACK received from the BTS is expected to contain its listen
address and port.   In some cases osmo-bts may indicate nonsense
addr='0.0.0.0', and indeed the RTP_Emulation component is not gonna
like this.  This makes both BTS_Tests.TC_speech_rtp_tch[fh] test
cases fail whenever executed in Docker:

  Connection refused (unexpected)

Let's work this around by sending the remote IP and port IEs in
additional MDCX message and omitting them in CRCX.  This mimics
osmo-bsc's behavior and makes both test cases pass.

Change-Id: I03453e72f62819989dfe6aa12d8bd889fced1046
Related: OS#5242
1 file changed