Changes

ttcn3-msc-test: set 'hlr' / 'ipa-name' explicitly

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.

Change-Id: I7757aae1d01b679f530b5c0a6c95b224cb9f204f
Related: osmo-ttcn3-hacks.git Ic24d3082fe3dce08e43e8f3ecb6d6132503c55c6
Related: osmo-msc.git I7bacd001b81326c32bc262c7d0c0491ded822fa8
Related: OS#6135