'Remove a tag from an asset
:param asset: The asset to remove a tag from. (required)
:type  asset: :class:`Node` or :class:`NodeImage` or
:class:`DimensionDataNewtorkDomain` or
:class:`DimensionDataVlan` or
:class:`DimensionDataPublicIpBlock`
:param tag_key: The tag key you want to remove (required)
:type  tag_key: :class:`DimensionDataTagKey` or ``str``
:rtype: ``bool``'

def ex_remove_tag_from_asset(self, asset, tag_key):

    asset_type = self._get_tagging_asset_type(asset)
    tag_key_name = self._tag_key_to_tag_key_name(tag_key)
    apply_tags = ET.Element('removeTags', {'xmlns': TYPES_URN})
    ET.SubElement(apply_tags, 'assetType').text = asset_type
    ET.SubElement(apply_tags, 'assetId').text = asset.id
    ET.SubElement(apply_tags, 'tagKeyName').text = tag_key_name
    response = self.connection.request_with_orgId_api_2('tag/removeTags', method='POST', data=ET.tostring(apply_tags)).object
    response_code = findtext(response, 'responseCode', TYPES_URN)
    return (response_code in ['IN_PROGRESS', 'OK'])
