Openfire side of allowing MUC delegates to handle invitation requests themselves, or reject them entirely. Relates to http://www.jivesoftware.com/issues/browse/CS-4034, r=Armando

git-svn-id: http://svn.igniterealtime.org/svn/repos/openfire/trunk@10167 b35dd754-fafc-0310-a699-88a17e54d16e