https://rdoproject.org/repos/rdo-release.rpm points
the latest release. Therefore, we need to use stable
repos for the stable release.
backport: mitaka
Change-Id: I3eaa302e66c335e0addad2588ceba8a5ee343582
Co-Authored-By: Youhei Tooyama <ytooyama.gtrans@tooyama.org>
Closes-Bug: #1691900