Add support for ConnectionDrainingPolicy
Add support for ConnectionDrainingPolicy

kornypoet/cfndsl,elmobp/cfndsl,webdevwilson/cfndsl,stevenjack/cfndsl,howech/cfndsl,kornypoet/cfndsl,erikmack/cfndsl,yogin/cfndsl,elmobp/cfndsl,josephglanville/cfndsl,stevenjack/cfndsl,sbasir/cfndsl,k-ong/cfndsl,base2Services/cfndsl,jonjitsu/cfndsl,mike1372/cfndsl