burn: raspberry burn with --inventory fails

[rickotten]

cms burn raspberry "red" --inventory=inventory-red.yaml --device=/dev/disk2 -v fails when inventory is:

cms inventory list --inventory=inventory-red.yaml
inventory list --inventory=inventory-red.yaml
+-------+-------------+---------+---------+--------------------+----------+------------------------+----------+--------+------------------------------+--------+---------+-------------+-------------------+
| host  | tag         | cluster | service | services           | ip       | dns                    | router   | locale | timezone                     | owners | comment | description | keyfile           |
+-------+-------------+---------+---------+--------------------+----------+------------------------+----------+--------+------------------------------+--------+---------+-------------+-------------------+
| red   | latest-full |         | manager | ['bridge', 'wifi'] | 10.1.1.1 |                        |          | us     | America/Indiana/Indianapolis |        |         |             | ~/.ssh/id_rsa.pub |
| red01 | latest-lite |         | worker  |                    | 10.1.1.2 | ['8.8.8.8', '8.8.4.4'] | 10.1.1.1 | us     | America/Indiana/Indianapolis |        |         |             | ~/.ssh/id_rsa.pub |
+-------+-------------+---------+---------+--------------------+----------+------------------------+----------+--------+------------------------------+--------+---------+-------------+-------------------+