'Delete IPAM subnet.
IPAM subnet no longer has foreign key to neutron subnet,
so need to perform delete manually
:param context: neutron api request context
:param neutron_subnet_id: neutron subnet id associated with ipam subnet'

@classmethod
def delete(cls, context, neutron_subnet_id):

    return ipam_objs.IpamSubnet.delete_objects(context, neutron_subnet_id=neutron_subnet_id)
