[one-users] Add `SSH_PUBLIC_KEY` to contextualization to set root credentials.

[Stefan Kooman]

Quoting Christophe Duez (christophe.duez at student.uantwerpen.be):
> Hello
> In the marketplace you can download images.
> However in the discription this is says: Add `SSH_PUBLIC_KEY` to
> contextualization to set root credentials
> what do they mean with this?
In the template you create to use this image you have to provide your
"SSH_PUBLIC_KEY" so you can log in with ssh and your private key. Root
password is not set. So you can only log in through ssh. You might also
"chroot" the image (using a linux live environment like GRML [1]), set a
password there and log in through console or ssh with a password.

Gr. Stefan

[1]: http://grml.org/

P.s make sure the image is "persistent" if you set a password, otherwise
your changes will be lost.

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