Avery only supports authentication for a single machine per user

[sakarias88]

You are on computer 1 and start avery for the first time (ignoring socket activation step) avery will create id_ecdsa.pem and id_ecdsa_pub.pem. Avery will then upload the public part to rolodex. Avery does not care if there is already an entry and overwrites the pub key in rolodex.

Now I remote in to computer 2 where I've already done those steps previously.
From this machine I use bendini to list functions on another users machine. I will fail to authenticate because the new pub key in rolodex does no longer match my local one since it got overwritten.

Suggested solution:
Support a list of public keys per user in rolodex.
Could do this change when we move auth out from avery.