cache_storage: remove useless test + update function name in debug log + skip...

cache_storage: remove useless test + update function name in debug log + skip as soon as we know headers do not match

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@1452281 13f79535-47bb-0310-9956-ffa450edef68