res_pjsip_endpoint_identifier_ip: Fix parsing of match value with CIDR

Also fixes comma separates match lists

ASTERISK-24290 #close
Reported by: Ray Crumrine
Review: https://reviewboard.asterisk.org/r/3995/
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Merged revisions 423417 from http://svn.asterisk.org/svn/asterisk/branches/12


git-svn-id: http://svn.asterisk.org/svn/asterisk/branches/13@423425 f38db490-d61c-443f-a65b-d21fe96a405b