Hopefully fix some intermittent unit test failures in buildbot

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1516955 13f79535-47bb-0310-9956-ffa450edef68
Add note on WebSocket 1.0 requiring Java 7.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1516959 13f79535-47bb-0310-9956-ffa450edef68
Add the WebSocket changes to the changelog.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1516960 13f79535-47bb-0310-9956-ffa450edef68