Allow module to manage "/etc/ssh/ssh_known_hosts" file.

[arthurfurlan]

Allow module to manage "/etc/ssh/ssh_known_hosts" file.

ssh::resource::known_hosts { 'global-known-hosts':
  hosts               =>  'github.com,bitbucket.org',
  user                =>  'root',
  root                =>  '/etc/ssh',
  known_hosts         =>  '/etc/ssh/ssh_known_hosts',
  known_hosts_mode    =>  '0644',
}