Proof of concept for allowing sudo without a password for bosh ssh.

This pull request is just for discussion and a little more work would need to be done.

Is there any reason not to allow sudo with no password during bosh ssh sessions? This would make it easier to run single commands that require sudo.

It would also eliminate a step during bosh ssh where most people type a dummy password like 'p' and retype it again a few minutes later. The username and password of the ssh user are already random and only used during that session.

Any thoughts?