WL#4189 mtr.pl v2

 - Bypass --secure-file-priv by loading the file from the client
   using LOAD DATA LOCAL INFILE

mysql-test/include/check-warnings.test

@@ -30,7 +30,7 @@ let $log_error= query_get_value(show variables like 'log_error', Value, 1);
 let $log_warning= $log_error.warnings;
 
 # Load the warnings into a temporary table
-eval load data infile '$log_warning' into table error_log
+eval load data local infile '$log_warning' into table error_log
   fields terminated by 'xykls37'
   ignore 1 lines
   (line)