res_rtp_asterisk: Fix one way audio problems with hold/unhold when using ICE

ICE sessions will now be restarted if sessions are changed to use new sets of
remote candidates.

(closes issue ASTERISK-22911)
Reported by: Vytis Valentinavičius
Review: https://reviewboard.asterisk.org/r/3275/


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@409565 f38db490-d61c-443f-a65b-d21fe96a405b
AO2: Add an assert for bad objects

This adds an assert that will only be active if Asterisk is compiled
with DO_CRASH and allows the testsuite to fail tests that would
otherwise require log file parsing.
........

Merged revisions 409566 from http://svn.asterisk.org/svn/asterisk/branches/1.8


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/11@409567 f38db490-d61c-443f-a65b-d21fe96a405b