Update 'fsfsfixer' to work with svnadmin v1.7+.
Update 'fsfsfixer' to work with svnadmin v1.7+.

* contrib/server-side/fsfsfixer/fixer/fix-rev.py
  (handle_one_error): Ignore the extra error message shown by svnadmin v1.7+.

git-svn-id: f8a4e5e023278da1e04e203c7fe051e3c4285d88@1554945 13f79535-47bb-0310-9956-ffa450edef68

YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion,YueLinHo/Subversion