Old osmo-msc versions do not include the Source Name IE in SMS related GSUP messages, unless it's set explicitly in the config file ('hlr' / 'ipa-name'). Recent osmo-msc versions (see the related osmo-msc patch) do include this IE even if it's not set explicitly ('unnamed-MSC').
Because of this, some testcases in ttcn3-msc-test are currently failing for osmo-msc master, but still passing for the -latest.
Let's set the 'ipa-name' explicitly in osmo-msc.cfg, so that we can expect both -master and -latest to include the Source Name IE.
