Remove unnecessary constants
Remove unnecessary constants

This patch removes the unused constants values. Some of them are
for the old libnetwork API spec and totally obsolete.

Change-Id: I4dd13903cbe9e2059c8bdadf7f13ea42d820b82e
Signed-off-by: Taku Fukushima <d385cb54d860d8a5dcc6157b54cf213091772451@gmail.com>
Closes-Bug: #1523388

midonet/kuryr,openstack/kuryr,celebdor/kuryr-libnetwork,openstack/kuryr,celebdor/kuryr-libnetwork,celebdor/kuryr,midonet/kuryr,celebdor/kuryr-libnetwork,celebdor/kuryr,midonet/kuryr