For https://issues.apache.org/bugzilla/show_bug.cgi?id=57190
Test case (currently commented-out) that demonstrates that getContext() erroneously returns the context for "/" instead of null for a wrong context name.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1643536 13f79535-47bb-0310-9956-ffa450edef68