This updates the Repositories and Review step as per [mocks](https://www.sketch.com/s/d7aa6d29-fca0-4283-a846-09cc5fd10612/a/MyEbDz7).
Repositories with the unavailable or invalid status have a popover that allows for further inspection. The time of the last introspection and the counter of failed attempts was added to the popover, together with the "Go to Repositories" button.
On Recreate the payload repositories are checked against "freshly" fetched list of repositories. In case any of the previously checked repositories is no longer available in content sources an Alert is rendered on both Repositories and Review steps. The unavailable repository is checked, but the checkbox is disabled and the information is dashed out. Since the information about the repository is stored in the Repository type, the only information available to be rendered is the baseurl.
Create image button is also disabled when recreating an image with unavailable repositories.
To avoid confusion between custom and payload repositories.
Custom repositories will be embedded in the yum config, payload
repositories are used for installing packages.
Fixes#919.
This updates the Review step as per proposed mocks.
The tabs were replaced by expandable sections containing all the information relevant to a specific step.
