* nua_client, nua_session: avoid restarting in-progress transactions
This is supposed to fix bugs #SFSIP-135 and #SFSIP-137. Thanks for Tamas
Jalsovszky and kawarod for reporting the problem.
git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@13062 d0543943-73ff-0310-b7d9-9358b9ac24b2