Fix documentation and add virsh power_type support
diff --git a/_modules/maas.py b/_modules/maas.py
index 6624f94..5907068 100644
--- a/_modules/maas.py
+++ b/_modules/maas.py
@@ -371,6 +371,8 @@
         if 'power_password' in power_data:
             data['power_parameters_power_pass'] = \
                 power_data['power_password']
+        if 'power_id' in power_data:
+            data['power_parameters_power_id'] = power_data['power_id']
         return data
 
     def update(self, new, old):