This code moves all deps to an external class so that Keystone can be
installed with mechanisms besides packages (like venv or docker). This
also cleans-up the dependency tree by removing false or confusing
dependencies.
Change-Id: If69cd7cba267f75faad51fdbc80a58b24d2095d8
Co-Author: Clayton O'Neill <clayton.oneill@twcable.com>
a5da52ec52