Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56677
Ensure that HttpServletRequest.getServletContext() returns the correct value during a cross-context dispatch. 

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1607935 13f79535-47bb-0310-9956-ffa450edef68
When the current PathInfo is modified as a result of dispatching a request, ensure that a call to HttpServletRequest.getPathTranslated() returns a value that is based on the modified PathInfo.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1607936 13f79535-47bb-0310-9956-ffa450edef68