MDEV-26: Global transaction ID, intermediate commit.

- Fix that slave GTID state was updated from the wrong place in the code,
   causing random crashing and other misery.

 - Fix updates to mysql.rpl_slave_state to not go to binlog (this would cause
   duplicate key errors on the slave and is generally the wrong thing to do).

sql/sql_repl.cc

@@ -3062,6 +3062,7 @@ rpl_load_gtid_slave_state(THD *thd)
     goto end;
   table_opened= true;
   table= tlist.table;
+  table->no_replicate= 1;
 
   /*
     ToDo: Check the table definition, error if not as expected.