Push attr conf event to all clients after device restart

Attribute properties may have changed during the restart. Push the event
to all registered subscribers to ensure that they get updated values.

Author: mliszcz

cppapi/server/dserver.cpp

@@ -1119,6 +1119,14 @@ void DServer::restart(std::string &d_name)
 			event_supplier_zmq->push_dev_intr_change_event(new_dev,false,cmds_list,atts_list);
 		}
 	}
+
+// Attribute properties may have changed after the restart.
+// Push an attribute configuration event to all registered subscribers.
+
+	for (Attribute* attr : new_dev->get_device_attr()->get_attribute_list())
+	{
+		new_dev->push_att_conf_event(attr);
+	}
 }
 
 //+-----------------------------------------------------------------------------------------------------------------