remove setter from CALookup

lookup.py

@@ -60,22 +60,6 @@ class CALookup(object):
         else:
             raise IndexError('Unknown CA "%s"' % ca_id)
 
-    def __setitem__(self, ca_id, authority_class):
-        """
-        Create a new certification authority
-        """
-
-        if authority_class not in self.allowed_auth:
-
-            raise ValueError('CA type is not supported')
-
-        else:
-
-            if not authority_class(ca_id):
-                authority_class(ca_id).generate()
-
-            else:
-                raise ValueError('CA %s already exists' % ca_id)
 
 class RequestLookup(object):
     """