Change the caching approach slightly.
Previously, resources were only cached if they were smaller than maxObjectSizeBytes. Now they are always cached (so the metadata is cached) but the content is only cached if they are smaller than maxObjectSizeBytes.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1549717 13f79535-47bb-0310-9956-ffa450edef68