cleanup: mtr startup warning

options --log-slow-admin-statements, --log-queries-not-using-indexes and --log-slow-slave-statements have no effect if --log_slow_queries is not set

1. s/--log_slow_queries/--log-slow-queries/
2. disable log-slow-admin-statement/etc in mytr when doing mysqld --help

mysql-test/mysql-test-run.pl

@@ -1833,6 +1833,9 @@ sub collect_mysqld_features {
   mtr_add_arg($args, "--lc-messages-dir=%s", $path_language);
   mtr_add_arg($args, "--skip-grant-tables");
   mtr_add_arg($args, "--log-warnings=0");
+  mtr_add_arg($args, "--log-slow-admin-statements=0");
+  mtr_add_arg($args, "--log-queries-not-using-indexes=0");
+  mtr_add_arg($args, "--log-slow-slave-statements=0");
   mtr_add_arg($args, "--verbose");
   mtr_add_arg($args, "--help");
 

sql/mysqld.cc

@@ -9480,7 +9480,7 @@ static int get_options(int *argc_ptr, char ***argv_ptr)
     sql_print_information("options --log-slow-admin-statements, "
                           "--log-queries-not-using-indexes and "
                           "--log-slow-slave-statements have no "
-                          "effect if --log_slow_queries is not set");
+                          "effect if --log-slow-queries is not set");
   if (global_system_variables.net_buffer_length > 
       global_system_variables.max_allowed_packet)
   {