[BUG][SSH] Lock yourself out of a node - PermitRootLogin prohibit-password

It must be my destiny to find all the SSH related bugs in PVE stack first-hand [1abcd]. Here's a new one!

Suppose you have done the reasonable thing and ssh-copy-id'd your keys to your nodes' root's authorized_keys. This is actually only necessary with one node alone as the information is shared, after all "root on any node is already effectively root on every node" [1e]. Well, that's convenient.

Then you have done the next reasonable thing and...

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