[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 - Vittorio Gambaletta (VittGam)

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Actually this is a quite bad regression, since passwordless telnet did not even start if an ssh public key was in place.
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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#comment378