This state manages /etc/ssh/ssh_known_hosts and fills it with
public SSH host keys of other minions.

This will add more options to set to secure openssh
- AllowUsers
- AllowGroups
- DenyUsers
- DenyGroups

When specifying multiple unknown ssh options, they would all appear on
the same line.

Synced file with default from Ubuntu 12.04 latest

This provides a default option (according to the package-provided config file) for each option in the config.