Make mod_dav_svn actually use the FSFS transaction directory cache during series of PUT requests.
Make mod_dav_svn actually use the FSFS transaction directory cache during
series of PUT requests.

Prior to this changeset, we were adding a uuid to the cache prefix,
and that prevented mod_dav_svn from reusing the cache between two PUT
requests, i.e., after reopening the filesystem / getting the transaction
root.  We only need to insert the uuid for older filesystem formats that
don't track the global transaction ID via db/txn-current file.

* subversion/libsvn_fs_fs/caching.c
  (svn_fs_fs__initialize_txn_caches): Don't use a uuid in the cache prefix
   for newer filesystem formats.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1723720 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion