* s2dns: added s2_dns_set_filter()
  Ignore-this: dc9bf478b6a90d5b351b56c3d77a7ec9



git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@12283 d0543943-73ff-0310-b7d9-9358b9ac24b2