On the fsfs-improvmements branch: Follow-up to 1506978.
Use the same defaults in mod_dav_svn as we use in svnserve.

* subversion/mod_dav_svn/mod_dav_svn.c
  (create_dir_config): toggle the default to "ON"
  (cmds): update help text

Found by: danielsh

git-svn-id: https://svn.apache.org/repos/asf/subversion/branches/fsfs-improvements@1510166 13f79535-47bb-0310-9956-ffa450edef68