Force is unharmfull in adding. In update is needed.

Adding it.
diff --git a/_modules/maas.py b/_modules/maas.py
index 3aa4e72..f881903 100644
--- a/_modules/maas.py
+++ b/_modules/maas.py
@@ -412,8 +412,7 @@
         }
         if 'default_gateway' in interface:
             data['default_gateway'] = interface.get('gateway')
-        if self._update:
-            data['force'] = '1'
+        data['force'] = '1'
         data['system_id'] = str(machine['system_id'])
         data['interface_id'] = str(machine['interface_set'][0]['id'])
         return data