MSC_ConnectionHandler: allow to use IPV4 as default

When the BSC sends a CRCX without an IP address in it, the testcase will
automatically assign an IPV6 address in the response. However, this
breaks compatibility with older versions of osmo-bsc that do not have
IPV6 support. Lets add a module parameter in order to be able to use
IPV4 as default if required.

Change-Id: I30c77abef63636bb02db12d2f2b2d79ea244b96c
2 files changed