Corrected floating ip allocation

Floating IPs were not getting allocated to the test VMs, and causing
the test/setup script to hang on "waiting for vms to come up".  The awk
was returning the wrong field to compare against.

    ++ echo '| 173.247.112.56 |           | None     | external |'
    ++ awk '{print $4}'
    + instance='|'
    + '[' '|' == None ']'
Merge pull request #35 from blueboxgroup/floating-ip-alloc-fix

Corrected floating ip allocation