* No longer setting Device name in the network interface since we can't
match up the info here with real device names.
* Add attributes for all external IPs if more than one exists.
This reads the following:
* hostname
* instance id
* machine-type
* zone
* internal IP
* external IP (if any)
* tags
* attributes
Atributes are placed under the platform.gce.attr.* hierarchy.
Tags are set up as platform.gce.tag.TagName=true.
Daniel Imfeld