Fix issue #1786: mod_dav_svn accepts multiple authors, only records one
Fix issue #1786: mod_dav_svn accepts multiple authors, only records one

* subversion/mod_dav_svn/repos.c

  (dav_svn_prep_working): Set the txn author if not previously set.  Protect
   against multi-author commits by verifying authenticated user associated
   with the current request is the same as the txn author.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@849151 13f79535-47bb-0310-9956-ffa450edef68

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