Other places, such as “ssh.GetUserFiles”, use a structure where the
private key comes before the private key. Until now prepare-node-join
did the opposite, that is the public key came first. To avoid confusion
and potential bugs, this is changed.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

While writing the initial version of this design I misunderstood what
“setup-ssh” does. It doesn't actually start the node daemon and just
configures SSH, nothing else.

This patch adds the cluster name as a field to the JSON structure and
clarifies the purpose of the node daemon certificate given.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>

The goal is to remove the dependency on Paramiko.

Signed-off-by: Michael Hanselmann <hansmi@google.com>
Reviewed-by: Iustin Pop <iustin@google.com>