[sytle] use http code constant instead of int
[sytle] use http code constant instead of int

To keep the consistency, using http_client.ACCEPTED instead
of 202 in contrib/api/services.py

Change-Id: I495fffe7180a0b1120b2413baef38d92ced8fd56

mahak/cinder,openstack/cinder,openstack/cinder,j-griffith/cinder,mahak/cinder,j-griffith/cinder,phenoxim/cinder,phenoxim/cinder