With Ben, make sure we get proper authorization for updates of disjointly switched working copies.
With Ben, make sure we get proper authorization for updates of
disjointly switched working copies.

* subversion/mod_dav_svn/update.c
  (authz_read): Handle txn roots.
  (dav_svn__update_report): Reactivate authz_read callback in calls to
    svn_repos_dir_delta.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@847805 13f79535-47bb-0310-9956-ffa450edef68

wbond/subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion,wbond/subversion,wbond/subversion,wbond/subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,wbond/subversion,YueLinHo/Subversion