Allow to provide a list of hosts to randomly connect to

[nir0s]

trafficstars

Currently, the conn value in an ssh type key can only receive a single connection string.

It would be nice to allow a user to pass conn=user@ip1,user@ip2,... and then host will choose randomly which host to connect to. This will allow users to see random servers when they're checking things, not only a single (potentially misleading) one.