Fixes #8210 - Adding caching for smart-proxy puppet classes using Stefan Julin's implementation of cache

> I think it'd be best to have it default (or even be hardcoded) to the
> installation dir + '/cache/', then in the packaging we can symlink
> /usr/share/foreman-proxy/cache to /var/cache/foreman-proxy in a
> similar way to how we do other directories (inc in Foreman core).

This sounds like a plan.

Just make the default value relative to the installation dir ("cache/")
and then raise a packaging PR to create the symlink. It's one liner, I
can help you with that.

LZ

-- 
Later,
 Lukas #lzap Zapletal