Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56025
Always call ServerEndpointConfig.Configurator.getNegotiatedSubprotocol()
CReate the EndPoint instance after calling ServerEndpointConfig.Configurator.modifyHandshake()

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1559081 13f79535-47bb-0310-9956-ffa450edef68