Drop checks role from setup-foreman-proxy

[ehelms]

In their current form, the checks only apply to the Foreman itself.

[ehelms]

@stejskalleos, @evgeni what do you think?

[stejskalleos]

LGTM

[evgeni]

@ehelms which checks did you not want to run on a proxy? check_system_requirements?

I am asking because #188 adds it back, effectively, so I want to follow up with a feature-based disablement.

[ehelms]

@ehelms which checks did you not want to run on a proxy? check_system_requirements?

I am asking because #188 adds it back, effectively, so I want to follow up with a feature-based disablement.

The database check, and system requirements.