-ServerInviteSession - fixed handling of UDAPTE glare, sending of 491 after we have sent an UPDATE 
-ServerInviteSession - fixed handling of UPDATE glare, for reception of UPDATE after a 491/UPDATE 




git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-uasprack-20130904@10646 ddefafc4-47db-0310-ae44-fa13212b10f2
TFM DUM Changes
-added TFM DUM TestSipEndpoint support for sending PRACK requests
-added TFM DUM TestSipEndpoint support for sending 100rel supported or requires header in INVITES
-added Allow header to TFM DUM TestSipEndpoint invite messages 
-added more UAS Prack test cases to TFM DUM for UPDATE glare conditions

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/b-uasprack-20130904@10647 ddefafc4-47db-0310-ae44-fa13212b10f2