Fix client subprotocol handling (pass protocol names from the annotation).

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1631817 13f79535-47bb-0310-9956-ffa450edef68
Use constant strings for header names.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1631818 13f79535-47bb-0310-9956-ffa450edef68