Expose negotiated subProtocol to the Session
Add some plumbing for exposing path parameters

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1446694 13f79535-47bb-0310-9956-ffa450edef68
Rename. All endpoints, not just Pojos will need this.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1446699 13f79535-47bb-0310-9956-ffa450edef68