Remove more unneeded code from the update move handling: don't open
pristine files and remove unused arguments.

* subversion/libsvn_wc/wc_db_update_move.c
  (tc_editor_add_directory): Remove children argument.
  (tc_editor_add_file): Remove contents argument.
  (tc_editor_alter_directory): Remove children argument.
  (tc_editor_alter_file): Remove new contents argument.

  (update_moved_away_node): Update caller.
  (suitable_for_move): Tweak code to avoid warning.


git-svn-id: https://svn.apache.org/repos/asf/subversion/trunk@1539148 13f79535-47bb-0310-9956-ffa450edef68