prow/github/fakegithub/fakegithub.go
func (f *FakeClient) IsCollaborator(org, repo, login string) (bool, error) {
	normed := github.NormLogin(login)
	for _, collab := range f.Collaborators {
		if github.NormLogin(collab) == normed {
			return true, nil
		}
	}
	return false, nil
}
func (f *FakeClient) IsCollaborator(org, repo, login string) (bool, error) {
	normed := github.NormLogin(login)
	for _, collab := range f.Collaborators {
		if github.NormLogin(collab) == normed {
			return true, nil
		}
	}
	return false, nil
}
// IsCollaborator returns true if the user is a collaborator of the repo.