jio: revert "Follow naming convention"

This revert e7083872ad. This change must be applied
only when we will have newer version of slapos.cookbook
Add pyOpenSSL component
simplify and improve varnish configuration.
version up : curl 7.31.0, including security fixes.
set default_ttl=0 in varnishd

so that responses without max-age will not be cached.