MGCP_Test: fix TC_one_crcx_loopback_rtp_implicit

The testcase TC_one_crcx_loopback_rtp_implicit uses
f_TC_one_crcx_loopback_rtp, which creates the RTP flow with IPv4
addresses but since we do not send a local RTP IP address with the CRCX
to the MGW, the MGW will prefer IPv6, which means that we get an IPv6
address back while the RTP strem is IPv4 on the TTCN3 side.

Related: OS#5123
Change-Id: I80498737d5b32f28b62e0c17cce1969b54af948c
1 file changed