Corrected floating ip allocation

Ran into another OSX awk issue with `ensure_free_floating_ip`.
Is a similar issue to 2f3baad677656a104d561bb95d730ba314972f80.
Continue to hit my tenant floating IP quota, b/c unused floating
IPs are not reused.
Merge pull request #42 from blueboxgroup/ensure-free-floating-ip-fix

Corrected floating ip allocation