time ./revert_instance_from_snapshot.sh -i snapshot_test -s snap1       

Querying snapshot_test...
Floating IPs:  192.168.11.7  192.168.11.8                 
Removing floating ip 192.168.11.7 from snapshot_test
Re-allocating 192.168.11.7 to the floating-ip pool
+--------------+-------------+----------+------+
| Ip           | Instance Id | Fixed Ip | Pool |
+--------------+-------------+----------+------+
| 192.168.11.7 | None        | None     | nova |
+--------------+-------------+----------+------+
Removing floating ip 192.168.11.8 from snapshot_test
Re-allocating 192.168.11.8 to the floating-ip pool
+--------------+-------------+----------+------+
| Ip           | Instance Id | Fixed Ip | Pool |
+--------------+-------------+----------+------+
| 192.168.11.8 | None        | None     | nova |
+--------------+-------------+----------+------+
deleting snapshot_test
booting snapshot_test from snapshot 
New ID for instance snapshot_test: 61722460-b18c-47dd-b20c-65bb62c01341
Adding floating ip 192.168.11.7 to 61722460-b18c-47dd-b20c-65bb62c01341
Adding floating ip 192.168.11.8 to 61722460-b18c-47dd-b20c-65bb62c01341
+--------------------------------------+---------------+--------+--------------------------------------------------+
| ID                                   | Name          | Status | Networks                                         |
+--------------------------------------+---------------+--------+--------------------------------------------------+
| 61722460-b18c-47dd-b20c-65bb62c01341 | snapshot_test | BUILD  | private=192.168.10.2, 192.168.11.7, 192.168.11.8 |
| c522f43d-f9da-422e-bd53-821a1595fb28 | snapshot_test | ACTIVE | private=192.168.10.2                             |
+--------------------------------------+---------------+--------+--------------------------------------------------+

Hang on and wait for the new instance (ID 61722460-b18c-47dd-b20c-65bb62c01341) to finish building before you try to login !

./revert_instance_from_snapshot.sh -i snapshot_test -s snap1  4.16s user 0.93s system 12% cpu 42.394 total