Bug #14737171: MTR DOES NOT PRESERVE TEST CASE LOGS ON RETRY-FAIL

mysql-test/mysql-test-run.pl

@@ -616,6 +616,8 @@ sub run_test_server ($$$) {
 	    else {
 	      mtr_report("\nRetrying test $tname, ".
 			 "attempt($retries/$opt_retry)...\n");
+              my $log_file_name= $opt_vardir."/log/".$result->{shortname}.".log";
+              rename $log_file_name,$log_file_name.".failed";
 	      delete($result->{result});
 	      $result->{retries}= $retries+1;
 	      $result->write_test($sock, 'TESTCASE');