expose validations

[sean797]

Let's expose the validations so we can use them in Ansible. One problem is that the validator field just contains a human description, we could parse it, but it would be nice if we didn't have to.

See more at theforeman/foreman-ansible-modules#296 (comment)

[evgeni]

I've started smth in #28, is that what you were looking for?

[evgeni]

#28 is now merged, please either close here or tell me what you're missing :)

also cc @ephracis for visibility