Tests for DomainBasedPermission

The code to test is here.

• Any authenticated user can list domains

• An anonymous user can't list a domain

• Only owners can delete a domain

• Admin can create + delete a repo inside the default domain

• Test domain creation + create repo inside domain using a user Authenticating with Basic Auth (create the user ahead of time via API)

• A user presnts an identity header just with their username and no org_id. Then try to create a domain, create a repo inside the domain, and then delete that domain.