WL#4198 mtr.pl v2

 - Use empty escape char as not to convert "\test" to a tab + "est"
   when loading the servers .err file

mysql-test/include/check-warnings.test

@@ -31,7 +31,7 @@ let $log_warning= $log_error.warnings;
 
 # Load the warnings into a temporary table
 eval load data local infile '$log_warning' into table error_log
-  fields terminated by 'xykls37'
+  fields terminated by 'xykls37' escaped by ''
   ignore 1 lines
   (line)
   set file_name='$log_error';