get realm by origin



git-svn-id: http://rfc5766-turn-server.googlecode.com/svn/trunk@1526 d3c6d0af-6456-5cbd-3218-6188ca4e956b
working on db



git-svn-id: http://rfc5766-turn-server.googlecode.com/svn/trunk@1527 d3c6d0af-6456-5cbd-3218-6188ca4e956b