Add fixture for RHOS
Fake Red Hat Account Handler
Fix negative test
Fake DownloadRelease task
Add RElease info to task result
Fake credentials validation
Add 'available' field to Release
Download Red Hat after account validation
Return 'available' field for Release
Fix fake download task
Fix codereview issues
Fix typo
Fix tasks filter
Remove copy&paste code from fake tasks
Rebased on master and fix validator