Add support for OS Parameters (#1191)

Signed-off-by: Shubham Ganar <shubhamsg123m@gmail.com>
(cherry picked from commit 5519019)

nailgun/entities.py

@@ -5587,12 +5587,21 @@ def __init__(self, server_config=None, **kwargs):
                 default='MD5',
             ),
             'title': entity_fields.StringField(),
+            'os_parameters_attributes': entity_fields.ListField(),
         }
         self._meta = {
             'api_path': 'api/v2/operatingsystems',
         }
         super().__init__(server_config=server_config, **kwargs)
 
+    def read(self, entity=None, attrs=None, ignore=None, params=None):
+        """Fetch as many attributes as possible for this entity."""
+        if attrs is None:
+            attrs = self.read_json()
+        if 'parameters' in attrs:
+            attrs['os_parameters_attributes'] = attrs.pop('parameters')
+        return super().read(entity, attrs, ignore, params)
+
     def create_payload(self):
         """Wrap submitted data within an extra dict.