Strip the XML namespace prefix from all element tags under the given root Element.

def _xml_namespace_strip(root):
    # type: (ET.Element) -> None
    """Strip the XML namespace prefix from all element tags under the given root Element."""
    if '}' not in root.tag:
        return  # Nothing to do, no namespace present

    for element in root.iter():
        if '}' in element.tag:
            element.tag = element.tag.split('}')[1]
        else:  # pragma: no cover
            # We should never get here. If there is a namespace, then the namespace should be
            # included in all elements.
            pass