res_pjsip_endpoint_identifier_ip: Accept hostnames in the 'match' field.

Hostnames specified in the 'match' field will be resolved and all addresses
returned. Each address will be added to the endpoint identifier for the
matching process.

Reported by: Rob Thomas
........

Merged revisions 404613 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@404620 65c4cc65-6c06-0410-ace0-fbb531ad65f3