Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56693
Fix various issues in the static resource cache implementation where the cache retained a stale entry after the successful completion of an operation that always invalidates the cache entry such as a delete operation.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1607660 13f79535-47bb-0310-9956-ffa450edef68