_parse_trunk_groups scans the provided configuration block and
        extracts all the vlan trunk groups.  If no trunk groups are configured
        an empty List is returned as the vlaue.  The return dict is intended
        to be merged into the response dict.

        Args:
            config (str): The vlan configuration block form the node's
                running configuration

        Returns:
            dict: resource dict attribute

def _parse_trunk_groups(self, config):
        """ _parse_trunk_groups scans the provided configuration block and
        extracts all the vlan trunk groups.  If no trunk groups are configured
        an empty List is returned as the vlaue.  The return dict is intended
        to be merged into the response dict.

        Args:
            config (str): The vlan configuration block form the node's
                running configuration

        Returns:
            dict: resource dict attribute
        """
        values = TRUNK_GROUP_RE.findall(config)
        return dict(trunk_groups=values)