Add update_peer function to unistim_rtp_glue, improve other unistim_rtp_glue functions conforming to other channel drivers. Do not forget auto-detected and user-selected phone settings on 'unistim reload'



git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/1.8@409705 f38db490-d61c-443f-a65b-d21fe96a405b