Do not require a review_url when asking to unretire master
    
    pkgdb-admin (the CLI tool) will now check for how long the package was
    retired and will ask for a new review if needed and will proceed
    otherwise.
    The change in pkgdb-admin is as of:
    https://github.com/fedora-infra/packagedb-cli/pull/98 which is part of
    the release: 2.14