Disable credential / repository form when embedded ansible is unavailable

[mzazrivec]

1. Create a new role, new group using that role and a new user using that group
2. Set the group restriction to one specific tag (edit the newly created group, assign filters, select one tag)
3. With the new user, navigate to Automation -> Ansible -> Credentials
4. Click on Add new Credential

Before:

After:

I also disabled the repository inputs for similar case.

@himdel review please?

https://bugzilla.redhat.com/show_bug.cgi?id=1560527

[miq-bot]

Checked commit mzazrivec@5880a30 with ruby 2.3.3, rubocop 0.52.1, haml-lint 0.20.0, and yamllint 1.10.0
2 files checked, 1 offense detected

**

• 💣 💥 🔥 🚒 - Linter/Haml - Linter::Haml STDERR:

warning: parser/current is loading parser/ruby23, which recognizes
warning: 2.3.6-compliant syntax, but you are running 2.3.3.
warning: please see https://github.com/whitequark/parser#compatibility-with-ruby-mri.

[himdel]

LGTM, mostly matches what's happening in repositories.

(I would not go so far as to disable every single input in the form, that's a first in ui-classic, but.. why not.)