Allow the JSR 356 WebSocket examples using the programmatic API (Endpoint subclasses) to work as they use a ServletContextListener that has @WebListener annotation, which would not be called with metadata-complete="true".

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1531680 13f79535-47bb-0310-9956-ffa450edef68