Add tr_RUA_Disconnect_opt_ranap that matches RUA Disconnect with and
without RANAP payload.
Use this in RUA_Emulation as_main_rua(), to trigger a RUA_Disc_Ind to
the CLIENT also for Disconnect without RANAP data.
Rationale:
This patch exists for the line
RUA.receive(RUA_Disc_Ind:?);
in the TC_apply_sccp patch Ia1ff0cb56893edf045ea3cb3233882ca93445d21
In upcoming HNBGW_Tests.TC_apply_sccp, I want to test for an ungraceful
RUA Disconnect, which is sent without a RANAP payload. But
tr_RUA_Disconnect only matches when a RANAP Message IE is present. In
consequence, RUA_Emulation ignores "empty" RUA Disconnect, and my test
case cannot verify that the RUA Disconnect occurred. Fix that.
Change-Id: Ia0b89e9198794d196a88040ee89bdf24f3b08ae0
Neels Hofmeyr
8f5c80d070