VPLS DHCPv6 snooping commands for SAP and SDP bindings

config
    - service
        - vpls service-id [customer customer-id] [create] [vpn vpn-id] [m-vpls] [svc-sap-type {null-star | dot1q-preserve | any}] [b-vpls | i-vpls | r-vpls] [b-vid vid]
        - vpls service-id [customer customer-id] [create] [vpn vpn-id] [m-vpls] [svc-sap-type {null-star | dot1q-preserve | dot1q-range | any}] [customer-vid vlan-id]
        - no vpls service-id
            - mesh-sdp sdp-id[:vc-id] [vc-type {ether | vlan}]
            - no mesh-sdp sdp-id[:vc-id]
                - dhcp6
                    - [no] description description-string
                    - [no] shutdown
                    - [no] snoop [network-facing]
            - sap sap-id [split-horizon-group group-name] [g8032-shg-enable] [eth-ring ring-index] [create]
            - no sap sap-id 
                - dhcp6
                    - [no] description description-string
                    - [no] option
                        - interface-id
                        - interface-id ascii-tuple
                        - interface-id sap-id
                        - interface-id string string
                        - no interface-id
                        - [no] remote-id [mac | string string]
                    - [no] shutdown
                    - [no] snoop [client-facing | network-facing | both]
                    - [no] trusted
            - spoke-sdp sdp-id[:vc-id] [vc-type {ether | vlan}] [create] [split-horizon-group group-name] [use-evpn-default-shg] 
            - no spoke-sdp sdp-id[:vc-id] 
                - dhcp6
                    - [no] description description-string
                    - [no] shutdown
                    - [no] snoop [network-facing]