* Pillar openssh.known_hosts_salt_ssh

* Dropped ill-named file

* Fixed aliasing of host names

* Improved pillar.example

* Opt-in to include localhost

* pillar/known_hosts_salt_ssh: clear cache in run()

* Dropped forgotten debugging output

in order to prevent unnecessary changes due to
random ordering of dig results.

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