Full review (do not merge)

> The smart-proxy RPM package does not contain a gem so having it in BuildRequires does not help. Or should I clone it from git?

Nono, no cloning please.

I thought you are able to run the tests having foreman-proxy installed
by modifying RUBYLIB or something. If that does not work - no problem.

-- 
Later,
 Lukas #lzap Zapletal