chan_pjsip: Add support for passing hold and unhold requests through.

This change adds an option, moh_passthrough, that when enabled will pass
hold and unhold requests through using a SIP re-invite. When placing on
hold a re-invite with sendonly will be sent and when taking off hold a
re-invite with sendrecv will be sent. This allows remote servers to handle
the musiconhold instead of the local Asterisk instance being responsible.

Review: https://reviewboard.asterisk.org/r/4103/


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@427112 f38db490-d61c-443f-a65b-d21fe96a405b
chan_pjsip: Update CHANGES file to include 'moh_passthrough' setting


git-svn-id: http://svn.asterisk.org/svn/asterisk/trunk@427113 f38db490-d61c-443f-a65b-d21fe96a405b