Fixes #3860 - automated discovery provisioning

Replaces https://github.com/theforeman/foreman_discovery/pull/97
> > +    true
> 
> Should we return the failure case to the UI so the users knows to go manually reboot the host?

This was a leftover from my previous testing. Removed.

This is a different discussion... ;-)

-- 
Later,
 Lukas #lzap Zapletal