Add query for neutron floating ip bug 1383347

I couldn't find any more specific errors in the neutron
logs, so guessing this is just a race in status changes.

735 hits in 7 days, check and gate, fall failures.

Change-Id: Ie2c66c02516ae3a47e0a7929b766c4d498b8b1f3
Related-Bug: #1383347