Remove remaining reference to Servlet classes to server web socket package

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1436239 13f79535-47bb-0310-9956-ffa450edef68
Add <distributable/> to web-fragment.xml in tomcat-websocket.jar.

Servlet Spec says:
The web.xml resulting from the merge is considered <distributable>
only if all its web fragments are marked as <distributable> as well.

Therefore, in order to user deploy distributable web application, tomcat-websocket's web-fragment.xml should contain the <distributable/>.
Otherwise, users are forced to set metadata-complete="false" in their web.xml or add <distributable/> to  web-fragment.xml inside the tomcat-websocket.jar.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1436243 13f79535-47bb-0310-9956-ffa450edef68
Fix incorrect increment of counterSend_EVT_SESSION_EXPIRED and counterSend_EVT_CHANGE_SESSION_ID.
These values are not incremented if no members active in cluster group.


git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1436249 13f79535-47bb-0310-9956-ffa450edef68