MSC: match default expectation with config

In MSC_Tests.default we expect /tmp/mncc.sock as MNCC socket path -
let's match this expectation with osmo-msc.cfg to make sure that tests
work out of the box without the need to use specific command-line
option.

Change-Id: I540645ef4b1e08d05b89251f074af84a516e7a88
1 file changed