BSC_Tests_CBSP: use proper default values for mp_cbc_ip / mp_cbc_ip6

Otherwise it's impossible to run the CBSP test cases locally, because
the remote peer address in osmo-bsc gets set to '0.0.0.0', so indeed
it cannot establish connection to the server.

Change-Id: I5b1d215818255717ed955c9f1a9c45505ab11a65
Fixes: OS#5351
1 file changed