[Bug 1403617] Re: gce datasource does not handle instance ssh keys

[Dan Watkins]

smoser and I had a conversation in #cloud-init about this on Friday.

Our conclusion was that we should mirror what the cloud vendor is doing
(i.e. ignore project-level keys if instance-level keys are specified).

We also discussed how we could configure an instance in a project _with_
SSH keys to start _without_ any SSH keys. smoser proposed (a) using the
presence of the empty string in the instance sshKeys metadata value. He
also noted that (b) creating a fresh key, attaching it as an instance-
level SSH key and instantly shredding it would also give the desired
behaviour.

I think that this requirement is uncommon enough that (b) should
suffice. Furthermore, I can imagine (a) breaking automation that would
work with just GCE's daemons (as they just ignore the empty string).

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Title:
  gce datasource does not handle instance ssh keys

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