Fixes and cleanups for mod_cache;

Fixes and cleanups for mod_cache;

    * Add r->uri to the debug messages in the quick handler; makes debugging
      easier.

    * Always reset headers_in for lookup's, some modules make subrequests
      and then rewrite the url. Having a conditional request at this point
      is not what they expect (nor reasonable for them to handle).

    * Don't store a per-request config on lookups; for the same reason.

    * Return DECLINED when in lookup mode and ap_meets_conditions() indicated
      we have the content but don't know if it's fresh or not. We have no idea
      whether the backend will have a 404, a 304 or any other kind of a
      response - so we have to assume we cannot handle the request.

    * remove the unused "url" argument from the cache_create_entity() function

    * Whitespace/comment fixups in mod_cache.h

git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@291588 13f79535-47bb-0310-9956-ffa450edef68