fixes #16484 - hostgroup - fix create params

[bbuckingham]

Update to sync up the extensions params with foreman as well
as fix 'ActiveModel::ForbiddenAttributesError' error.

[jlsherrill]

[test]

[jlsherrill]

we really need to add a way to add things rather than continuing this madness :)

[jlsherrill]

ACK

[stbenjam]

@bbuckingham Isn't this missing activation keys?

[bbuckingham]

@stbenjam, there is some hidden magical logic that creates a group parameter to store the activation key associated with the hostgroup. I believe it is controlled by https://github.com/Katello/katello/blob/master/app/assets/javascripts/katello/hosts/activation_key_edit.js

[bbuckingham]

@jlsherrill, agreed, it would be good to have a different solution for this down the road. This was primarily to quickly address a regression.

[stbenjam]

Oh I see, for some reason I thought they were moved to attributes of the host group. Nevermind then, ACK

[bbuckingham]

@stbenjam, @jlsherrill, Thanks!