[Reviewer Matt] AKA authentication support

Matt

Are you happy to volunteer as the code reviewer for AKA support.  In terms of testing, this has been

-  unit tested to 100% code coverage (the authentication module plus the new store structures for the AV store and the changes to the registration store)
-  live tested both with a Bono downstream and with Perimeta, using a SIPp script (and a modified version of SIPp) as the UE.

Note that the Bono case won't work anymore with the changes to make Bono and Sprout compliant with TS 33.203 Annex P.

Mike