Fixes #7603,7792,7789 - Code to promote/publish dockered cv's

Contains the model/action bindings to promote content views that have
docker repos
Merge pull request #4749 from parthaa/cv

Code to promote/publish content views with docker repos
fixes #8588 - make repo indexing idempotent
Merge pull request #4851 from stbenjam/8588

fixes #8588 - make repo indexing idempotent
fixes #7668 - host errata mail notification
fixes #7666 - sync errata mail notification
fixes #7667 - promotion errata mail notification