Comment 4 for bug 1555387

This was listed in https://etherpad.openstack.org/p/stable-bug-candidates-from-master but I don't think this is a backport candidate. It looks like liberty doesn't do a retry at all - compare the liberty version (no retry) at https://github.com/openstack/neutron/blob/stable/liberty/neutron/ipam/drivers/neutrondb_ipam/driver.py#L194-L197 to the mitaka version (with retries) at https://github.com/openstack/neutron/blob/stable/mitaka/neutron/ipam/drivers/neutrondb_ipam/driver.py#L197-L202

So unless we want to backport the entire retry functionality (which seems like a functional change) I think this should be removed from https://etherpad.openstack.org/p/stable-bug-candidates-from-master