Gitorious used to offer hosting on gitorious.org, and could optionally
be self-installed. We never supported the latter in our Gitorious
hosting service support. However, the former no longer exists, and
hasn't for a while, ever since GitLab bought Gitorious.

This change activates self-hosted support, and requires it. We don't
really need to worry about preserving compatibility for existing
repositories hosted on gitorious.org, because they wouldn't have worked
for quite a while now.

Unit tests have been updated to test with a hosting domain.

Unit tests pass.