Revision 1064734

Disallow attempts to proxy to the server root of a master server.  It
really just doesn't pan out well when you do.

* subversion/mod_dav_svn/mod_dav_svn.c
  (SVNMasterURI_cmd): Fail if the SVNMasterURI value points to a server root.

* subversion/mod_dav_svn/mirror.c
  (dav_svn__location_in_filter, dav_svn__location_body_filter): Expect
    that the master URI has a non-NULL path part.