-correct comments

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@11209 ddefafc4-47db-0310-ae44-fa13212b10f2
-added ability to callback to SipMessageLoggingHandler for retransmitted messages as well

git-svn-id: https://svn.resiprocate.org/rep/resiprocate/main@11210 ddefafc4-47db-0310-ae44-fa13212b10f2