Dmitri please review. Fix for BUG#10417 "CREATE TRIGGER not written to binlog":

writing DROP and CREATE TRIGGER to binlog, disabling binlogging
of substatements, testing.

sql/sql_trigger.h

@@ -52,7 +52,15 @@ public:
         FIXME: We should juggle with security context here (because trigger
         should be invoked with creator rights).
       */
+      /*
+	Guilhem puts code to disable binlogging, as in SP/functions, even
+        though currently triggers can't do updates. When triggers can do
+        updates, someone should add such a trigger to rpl_sp.test to verify
+        that the update does NOT go into binlog.
+      */
+      tmp_disable_binlog(thd);
       res= bodies[event][time_type]->execute_function(thd, 0, 0, 0);
+      reenable_binlog(thd);
 
 #ifndef EMBEDDED_LIBRARY
       thd->net.no_send_ok= nsok;