- fixed test


mysql-test/r/rpl_multi_update2.result:
  fixed setting/reseting environment
  multi-update with subquery added
mysql-test/t/rpl_multi_update2.test:
  fixed setting/reseting environment
  multi-update with subquery added
sql/sql_update.cc:
  set 'updating' in both tables list if we have two of them (because of subquery)