RPM Support

on repomd we have: primary.xml.gz update_info.xml.gz When testing xml.gz behaves like it is not compressed On the other hand, it behaves as compressed on S3 testing
https://github.com/pulp/pulp_rpm/blob/master/pulp_rpm/tests/functional/api/test_publish.py#L51-L67

def read_xml_gz(content):
    """
    Read xml and xml.gz.
    Tests work normally but fails for S3 due '.gz'
    Why is it only compressed for S3?
    """
    with NamedTemporaryFile() as temp_file:
        temp_file.write(content)
        temp_file.seek(0)

        try:
            content_xml = gzip.open(temp_file.name).read()
        except OSError:
            # FIXME: fix this as in CI primary/update_info.xml has '.gz' but it is not gzipped
            content_xml = temp_file.read()
        return content_xml