Changed Jingle and Jingle DTMF namespaces.

As both specifications are in the Experimental status, the namespaces
specified therein shall be of the form
"http://www.xmpp.org/extensions/xep-XXXX.html#ns".

See the Namespace issuance section in XEP-0053 :
http://www.xmpp.org/extensions/xep-0053.html#namespaces

git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@82314 65c4cc65-6c06-0410-ace0-fbb531ad65f3