Update UTF-8 decoder used by WebSocket connections.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1452745 13f79535-47bb-0310-9956-ffa450edef68
Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54602
Ensure URI converter is recycled in case of error in previous conversion

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1452756 13f79535-47bb-0310-9956-ffa450edef68