Another mod_cache fixlet.

* modules/cache/mod_cache.c

  (cache_url_handler): Add more debug output.  Restore original request
   headers when CACHE_SAVE filter isn't added to fix up after the request.


* modules/cache/cache_storage.c

  (cache_select_url): Add more debug output.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@157162 13f79535-47bb-0310-9956-ffa450edef68