res_rtp_asterisk: Ensure that the base and mapped address for candidates is present in SDP.

This change fixes an issue where ICE candidates put into the SDP did not contain
the 'raddr' and 'rport' information for server reflexive and relay candidates.

#SIPit31
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Merged revisions 424151 from http://svn.asterisk.org/svn/asterisk/branches/11
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Merged revisions 424152 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@424153 f38db490-d61c-443f-a65b-d21fe96a405b
res_pjsip_sdp_rtp: Don't place an extra whitespace before 'rport' and don't put IPv6 addresses in brackets.

#SIPit31
........

Merged revisions 424155 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@424156 f38db490-d61c-443f-a65b-d21fe96a405b