Fixed connect_debug.test to not depend on system error message

mysql-test/t/connect_debug.test

@@ -17,6 +17,7 @@ drop user bad;
 #
 set global debug_dbug='+d,auth_invalid_plugin';
 create user 'bad' identified by 'worse';
+--replace_regex /loaded: [^\n]*/loaded: invalid plugin name/
 --error 1
 --exec $MYSQL --default-auth=mysql_old_password --user=bad --password=worse 2>&1
 set global debug_dbug=@old_dbug;