Query via ssh #1
Description
As for now, the program simply spawn many threads to send ssh command to all the nodes. This is sensible if your working from a server and send commands to the node. Since this script are, also, user-side, it would be better to use telnet as in Whoall.
In fact, this "ssh approach" generates the error "Too many logins" when trying to connect to the same node the command comes from (I have no idea how and why this error is generate, actually) and if the user does not have the ssh-key configured, (s)he'll be asked for the password multiple times.