Improve printout for 'found warnings' and add an exit to please mysqltest

mysql-test/include/check-warnings.test

@@ -8,5 +8,6 @@ call mtr.check_warnings(@result);
 if (`select @result = 0`){
   skip OK;
 }
-echo Found warnings;
 --enable_query_log
+echo ^ Found warnings!!;
+exit;

mysql-test/include/mtr_warnings.sql

@@ -278,7 +278,7 @@ BEGIN
     SELECT @log_error;
     SELECT line as log_error
         FROM suspect_lines WHERE supressed=0;
-    SELECT * FROM test_supressions;
+    --SELECT * FROM test_supressions;
     -- Return 2 -> check failed
     SELECT 2 INTO result;
   ELSE