For https://issues.apache.org/bugzilla/show_bug.cgi?id=56882
Add testcase for processing of forwards and includes when Context have been reloaded. The bug is absent in Tomcat 7.

This is a backport of r1620326.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1620577 13f79535-47bb-0310-9956-ffa450edef68