[RFC] Telnet endpoint with TOTP

[coolacid]

Have a telnet endpoint (shutter, but it's supported in bpq) this will allow us to accept connections over Packet.

Since it's packet, it's unsecure. We can use a one time password system that we pre/post-pend to a command seq to ensure it's from someone we trust.

This is not perfect, as we still have a race condition if someone wanted to inject commands. We have to also track the used codes so we don't re-use them. (one command per code, means we should use faster codes, but then have less time to type them)