Fix some bugs related to updating.
Fix some bugs related to updating.

(update_ctx_t {}): add 'anchor' member to note the base path when
  replace_root is called. all update paths will be built off this path.

(upd_replace_root): use the new anchor member, rather than assuming "/"

(dav_svn__update_report): set up the uc.anchor member.
  HACK: if the node is a directory, then append "/." to it so that
  begin_report will see the correct directory after it does a split on the
  param. Will fix post-M3 when begin_report grows another param.


git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@839961 13f79535-47bb-0310-9956-ffa450edef68

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