When MoH is triggered with `sendrecv` flag (so that
the recipient, the one who is put on hold, sees
the sendrecv state instead of sendonly/inactive),
we have to correctly process the answer coming back
to the MoH originator.
The originator of MoH must see:
- recvonly to his sendonly
- inactive to his inactive
Hence OA model is kept correct for the originator's leg.
Additionally: accordingly correct MoH tests.
Change-Id: Ida5f074d302c419c1e57e4fd624a55bfddae5587
Support the recvfrom() function. This requires also returning to address
(not just the port) from the tester's rcv() function to be useful, which
in turn requires updating a bunch of tests.
Change-Id: I3c0bcab9b744f2c234662399199abc538876c4fa