Revert r1551352. Lazy init of WsServerContainer causes problems with Atmosphere that can't easily be avoided.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1552035 13f79535-47bb-0310-9956-ffa450edef68
Alternative partial fix for https://issues.apache.org/bugzilla/show_bug.cgi?id=55855. Don't do the expensive 'Is this a WebSocket upgrade request check' if no endpoints have been registered

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1552042 13f79535-47bb-0310-9956-ffa450edef68