download, filter and merge known_hosts for OpenSSH

 This package allows you to download public hostkeys from multiple sources,
 filter the hostnames coming with them and merge them together into one
 file for use by OpenSSH. Plugins included:
  * curl (optional GnuPG verification)
  * rsync (optional GnuPG verification)
  * psql
  * symlink
 New plugins can easily be written.