* add test for rolling back from a FAILED deployment

* Update naming of release variables

Use same naming as the rest of the file.

* Update rollback test

- Add logging
- Verify other release names not changed

* fix(tiller): Supersede multiple deployments

There are cases when multiple revisions of a release has been
marked with DEPLOYED status. This makes sure any previous deployment
will be set to SUPERSEDED when doing rollbacks.

Closes #2941 #3513 #3275