stop throwing deprecation warnings on init

We are directly subclassing object, which takes no args on __init__,
and indeed need not have __init__.  If we decide to, for some reason, add a
parent class to this method we might want to add this back, but we won't so we
don't need to care about that.

Change-Id: If58885515b9ae5c682d743dba8e4dfe6c9a5d1d9

nova/servicegroup/api.py

@@ -75,7 +75,6 @@ class API(object):
 
     def __init__(self, *args, **kwargs):
         self.basic_config_check()
-        super(API, self).__init__(*args, **kwargs)
 
     def basic_config_check(self):
         """Perform basic config check."""