On the revprop-caching-ng branch: Minor code cleanup.

* subversion/libsvn_fs_fs/revprops.c
  (ensure_revprop_generation): Rename this to ...
  (open_revprop_generation_file): ... that.
  (read_revprop_generation_file,
   write_revprop_generation_file, 
   has_revprop_cache,
   begin_revprop_change): Update callers.


git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/revprop-caching-ng@1620357 13f79535-47bb-0310-9956-ffa450edef68