[CXF-5546] NPE may be thrown and logged during WS-RM's retransmission

git-svn-id: https://svn.apache.org/repos/asf/cxf/trunk@1565162 13f79535-47bb-0310-9956-ffa450edef68
Recording .gitmergeinfo Changes
[CXF-5617] - Support SecureConversation with the Transport Binding