release: update for v1.9.7

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11195 ddefafc4-47db-0310-ae44-fa13212b10f2
rpm: Indicate that b2bua package is obsolete

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/branches/resiprocate-1.9@11197 ddefafc4-47db-0310-ae44-fa13212b10f2