Finish issue #1251 - ETag of directory is weaker than it claims.
Finish issue #1251 - ETag of directory is weaker than it claims.

* subversion/mod_dav_svn/repos.c
  (dav_svn_getetag): Add the 'W/' weak etag prefix when providing the
    etag of a collection.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@845779 13f79535-47bb-0310-9956-ffa450edef68

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