res_rtp_asterisk: Allow only UDP ICE candidates.

res_rtp_asterisk: Allow only UDP ICE candidates.

The underlying library, pjnath, that res_rtp_asterisk uses for ICE
support does not have support for ICE-TCP. As candidates are
passed through directly to it this can cause error messages to occur
when it receives something unexpected (such as a TCP candidate).
This change merely ignores all non-UDP candidates so they never
reach pjnath.

ASTERISK-24326 #close
Reported by: Joshua Colp
........

Merged revisions 424852 from http://svn.asterisk.org/svn/asterisk/branches/11

git-svn-id: https://origsvn.digium.com/svn/asterisk/branches/12@424853 65c4cc65-6c06-0410-ace0-fbb531ad65f3