[FS#123] Root passwordless logins allowed even if there is an SSH public key, and user is not warned of this

[LEDE Bugs]

The following task has a new comment added:

FS#123 - Root passwordless logins allowed even if there is an SSH public key, and user is not warned of this
User who did this - Ted Hess (thess)

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I think the lack of a warning message when connecting via ssh with no password set could be part of the confusion as well. It might make sense to add something back to give this warning. Connecting via Web UI does have the no-password warning.
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=123#comment417