Replace the stats code's local directory parser and underlying windows
caching and undeltifying code with the FSFS standard dir access mechanism.

* subversion/libsvn_fs_fs/stats.c
  (cache_key_t): Drop as now unused.
  (query_t): We don't need our local window cache anymore.
  (get_cached_window,
   set_cached_window,
   get_rep_content,
   read_windows,
   get_combined_window): Drop these window handling functions.
  (parse_dir): Take a proper noderev to select the directory to process
               and use the FSFS standard function to read the directory.
  (read_noderev): Update caller.
  (create_query): Remove init code for the defunct local cache.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1632851 13f79535-47bb-0310-9956-ffa450edef68