'Download the packages
:type pkg: KojiPkgSpec
:param pkg: a package specification
:type dst_dir: string
:param dst_dir: the destination directory, where the downloaded
packages will be saved on
:type arch: string
:param arch: packages built for this architecture, but also including
architecture independent (noarch) packages'

def get_pkgs(self, pkg, dst_dir, arch=None):

    rpm_urls = self.get_pkg_urls(pkg, arch)
    for url in rpm_urls:
        utils.get_file(url, os.path.join(dst_dir, os.path.basename(url)))
