Comment 1 for bug 1482521

The bug was introduced by me in commit 46608806aa7a9c60214e28429ca5a8b87b2a15de.
The difference of fip namespace is that it's name is "fip-<external network id>" as opposed to qrouter and snat namespaces where id is taken from the router. On resync agent keeps only namespaces which ids are known routers ids. FIP namespace is removed because it's id is not known router id. Will come up with the fix shortly.