Keep it using the older version in MNCC_Emulation for older versions of
osmo-sip-connector (last tagged released), since those doesn't support
MNCC7 yet.
Change-Id: I5dbacdd4bd8110b7f6cf6bdb561af420b65c035f
osmo-sip-connector master and the ttcn3 tests have moved to protocol version 6.
While the extension is gracefully handled by the ttcn templates to make do with
both protocol versions, the actual protocol version number sent to
osmo-sip-connector breaks the tests if it doesn't match. So that master can
still run v6 yet also pass 'latest', configure v5 when the version is not
'master'.
When 'latest' also moves to v6, we of course can revert this again.
Related: Iaca9ed6611fc5ca8ca749bbbefc31f54bea5e925 (osmo-sip-connector)
Related: I39d55432776926a385e1b85b21bcdea8180a8946 (osmo-ttcn3-hacks)
Change-Id: I2174e90bdea32f06cd3e8298696b93027e7906bc