show_os: Don't load archetypes twice
show_os: Don't load archetypes twice

Change-Id: Idc749de95a49ef75604f4cd3f65922d545279674
Reviewed-by: Dave Reeve <6a84ee3ae0690d4584b99406fb3076392171f50e@morganstanley.com>

guillaume-philippon/aquilon,guillaume-philippon/aquilon,quattor/aquilon,guillaume-philippon/aquilon,quattor/aquilon,quattor/aquilon