* nta.c: do not restart timer E when provisional response is received
  
  According to the (informational) RFC 4321 section 1.2 Timer E is not altered
  during the transition to Proceeding.



git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@11808 d0543943-73ff-0310-b7d9-9358b9ac24b2