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6259318521
This commit adds a functionality of attaching an auth token to gRPC connection as a per RPC credential. For doing this, this commit lets clientv3.Client.Dial() create a dedicated gRPC connection for doing authentication. With the dedicated connection, the client calls Authenticate() RPC and obtain its token. The token is attached to the main gRPC connection with grpc.WithPerRPCCredentials(). This commit also adds a new option --username to etcdctl (v3). With this option, etcdctl attaches its auth token to the main gRPC connection (currently it is not used at all).