* subversion/mod_dav_svn/repos.c   (dav_svn_prep_working): For attempted unsupported operations like     multi-author commits, return a 501 (Not implemented) rather than     a 500 (Internal server error).
* subversion/mod_dav_svn/repos.c
  (dav_svn_prep_working): For attempted unsupported operations like
    multi-author commits, return a 501 (Not implemented) rather than
    a 500 (Internal server error).

Review by: Sander Striker <striker@apache.org>


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@849274 13f79535-47bb-0310-9956-ffa450edef68

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