Revision 1741742

Work towards Python 3 compatibility.  Since we already require Python 2.7+,
we can use the new syntax without further limiting our Python 2 support.

Fix leftovers to complete the replacement of print statements with function
calls.

* contrib/client-side/svn-merge-vendor.py
  (del_temp_tree): Use a simple function call.

* contrib/server-side/fsfsverify.py
  (__main__):  Use the write function to output on stdout. Re-add the
               previously automatic newline.

* tools/server-side/svn-backup-dumps.py
  (SvnBackupOutputCommand):  This one is printing a tuple.  The function
                             call needs double parantheses here.