Add openssh client support

Right now, this module only manages the openssh server configuration. It would be useful to add the openssh-client package (on RedHat) and the ability to configure ssh_config as well.

Somewhat related to this, is there a reason that your modules use the operatingsystem fact instead of osfamily?

[alvagante]

When example42 "nextgen" or 2.x modules where started there was no osfamily yet and the wide usage of operatingsystem has been kept to keep compatibility with older puppet/facter versions.
On 3.x modules osfamily is used.

About client management I'd rather make a 3.x module from scratch, based on this skeleton:
https://github.com/stdmod/puppet-skeleton-standard

Would that new 3.x module handle both ssh-server and ssh-client configuration, or just client? They're pretty tightly related, so it would seem to make sense to configure both of them through one module.