Engine: Organization: deface core UI to include katello attributes

This commit contains changes that deface (extend) the core (foreman)
organization UI to include the following:

- on create:
  - label, description

- on edit:
  - label (readonly), description, default SLA
  - provide ability to download cert
Merge pull request #3467 from bbuckingham/engine-orgs-deface

Engine: Organization: deface core UI to include katello attributes