disable perfschema in mtr bootstrap

should fix numerous failures of main.bootstrap tets

mysql-test/mysql-test-run.pl

@@ -3076,6 +3076,7 @@ sub mysql_install_db {
   mtr_add_arg($args, "--core-file");
   mtr_add_arg($args, "--console");
   mtr_add_arg($args, "--character-set-server=latin1");
+  mtr_add_arg($args, "--disable-performance-schema");
 
   if ( $opt_debug )
   {