Scans the specified config and parse the trunk allowed vlans value

        Args:
            config (str): The interface configuration block to scan

        Returns:
            dict: A Python dict object with the value of switchport trunk
                allowed vlans value.  The dict returned is intended to be
                merged into the resource dict

def _parse_trunk_allowed_vlans(self, config):
        """Scans the specified config and parse the trunk allowed vlans value

        Args:
            config (str): The interface configuration block to scan

        Returns:
            dict: A Python dict object with the value of switchport trunk
                allowed vlans value.  The dict returned is intended to be
                merged into the resource dict
        """
        match = re.search(r'switchport trunk allowed vlan (.+)$', config, re.M)
        return dict(trunk_allowed_vlans=match.group(1))