[sr-dev] ruid access after failing t_relay

[Juha Heinanen]

i added possibility to call t_branch_timeout() and t_branch_replied()
from branch-failure event route.  i tested the possible result
combinations and they seemed to work ok.

however, during the tests is turned out that they don't help when it
comes to unregistering unresponsive contacts in case the contacts are
directly connected and set_forward_no_connect() is called before
t_relay().  the reason is that in that case, failure route or branch
failure route is not executed at all.

-- juha