Add saz/ssh-1.2.0 to export SSH keys

By exporting the SSH keys and importing them on every machine, we can
manage the known hosts file system wide.

This allows every jenkins slave to connect to our foreman server to
trigger an update of the puppet modules.

Change-Id: I67c4a846e5612f11c1329e3f9ffa7192e999f79b
Signed-off-by: Ewoud Kohl van Wijngaarden <ewoud@kohlvanwijngaarden.nl>