Verify that LLDP packets are punted with correct metadata.

• Connect ATE port-1 to DUT port-1, and ATE port-2 to DUT port-2.
• Disable on-box processing of LLDP.
• Enable the P4RT server on the device.
• Connect a P4RT client and configure the forwarding pipeline. Install the P4RT table entry required for LLDP.
• Send an LLDP packet from the ATE and verify that it is received by the client.
• Verify that the packet has the ingress_singleton_port metadata set and it corresponds to the interface ID of the port that the packet was received on.

rpcs:
  gnmi:
    gNMI.Get:
    gNMI.Set:
    gNMI.Subscribe:

vRX if the vendor implementation supports FIB-ACK simulation, otherwise FFF.