Update tests to check correct handling elements added between 2.5 and 3.0.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1569818 13f79535-47bb-0310-9956-ffa450edef68
Update tests to check correct handling elements added between 3.0 and 3.1
Add missing deny-uncovered-http-methods element from merged web.xml

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1569834 13f79535-47bb-0310-9956-ffa450edef68
Update changelog

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1569836 13f79535-47bb-0310-9956-ffa450edef68