example code to integrate grpctunnel

[dliu2223]

Hi,

I have existing gnnmi+gnoi servers and clients, I like to integrate the grpctunnel as part of the server & client code because the server will be outside out firewall, do you mind providing example code to show how to modify:

• client code when grpc.Dial is called to get the connection
• server code when net.Listen(), grpc.NewServer(), gnmi.RegisterGNMIServer() are called without the grpctunnel

Thanks

David