TransactionalStorageEngine::doRollback(session, all) "all" isn't true - need to check session autocommit settings

Very much related a bit to: https://bugs.launchpad.net/drizzle/+bug/682563

basically, the same for rollback:

int SEAPITester::doRollback(Session *session, bool all)
{
  if (all
    || !session_test_options(session, OPTION_NOT_AUTOCOMMIT | OPTION_BEGIN))
  {
    ENGINE_NEW_STATE("ROLLBACK");
    ENGINE_NEW_STATE("::SEAPITester()");
  }
  else
  {
    ENGINE_NEW_STATE("ROLLBACK STATEMENT");
    ENGINE_NEW_STATE("In Transaction");
  }

  return getRealEngine()->rollback(session, all);
}