We don't need a repository, and we only need a private user in one
example, so we can scope it locally there.

This will allow us to reuse them in an EE-only spec.

Multiple pipeline support for Build status

See merge request gitlab-org/gitlab-ce!30828

Adds specs for testing the new behavior of specifying a pipeline when
POSTing a status.

- Migration updates existing groups to "owner", then sets default to
  "maintainer" so that new groups will default to that
- Update spec examples

- Migration updates existing groups to "owner", then sets default to
  "maintainer" so that new groups will default to that
- Update spec examples

- Migration updates existing groups to "owner", then sets default to
  "maintainer" so that new groups will default to that
- Update spec examples