Add openssh known_hosts population

tasks/openssh.yml

@@ -17,9 +17,13 @@
   notify: reload openssh
 
 - name: openssh - root keys
-  authorized_key: user="root" key="{{ common_openssh_keys_root | join("\n") }}" exclusive=yes
+  authorized_key: user=root key={{ common_openssh_keys_root | join("\n") }} exclusive=yes
   when: common_openssh_keys_root
   tags: 'ssh-keys'
 
+- name: openssh - host keys
+  copy: src=known_hosts dest=/etc/ssh/ssh_known_hosts
+  failed_when: false
+
 - name: openssh - truncate /etc/motd
   copy: dest=/etc/motd content='' force=yes