Bug #48130 Expected failures should not count towards max-test-fail

Test batches may be terminated too early
Avoid counting exp-fail tests

mysql-test/lib/mtr_report.pm

@@ -146,6 +146,7 @@ sub mtr_report_test ($) {
           }
         }
         $fail = "exp-fail";
+        $tinfo->{exp_fail}= 1;
         last;
       }
     }