token-server: Add protos for new API for generating service account tokens.

tokenserver/client/tokenclient_test.go

 // Copyright 2016 The LUCI Authors.
 //
 // Licensed under the Apache License, Version 2.0 (the "License");
 // you may not use this file except in compliance with the License.
 // You may obtain a copy of the License at
 //
 //      http://www.apache.org/licenses/LICENSE-2.0
 //
 // Unless required by applicable law or agreed to in writing, software
 // distributed under the License is distributed on an "AS IS" BASIS,
@@ skipping 85 matching lines @@
 type fakeRPCClient struct {
         In  minter.MintMachineTokenRequest
         Out minter.MintMachineTokenResponse
 }
 
 func (f *fakeRPCClient) MintMachineToken(ctx context.Context, in *minter.MintMachineTokenRequest, opts ...grpc.CallOption) (*minter.MintMachineTokenResponse, error) {
         f.In = *in
         return &f.Out, nil
 }
 
-func (f *fakeRPCClient) MintDelegationToken(context.Context, *minter.MintDelegationTokenRequest, ...grpc.CallOption) (*minter.MintDelegationTokenResponse, error) {
-        panic("not implemented")
-}
-
 // fakeSigner implements Signer.
 type fakeSigner struct{}
 
 func (f *fakeSigner) Algo(ctx context.Context) (x509.SignatureAlgorithm, error) {
         return x509.SHA256WithRSA, nil
 }
 
 func (f *fakeSigner) Certificate(ctx context.Context) ([]byte, error) {
         return []byte("fake certificate"), nil
 }
 
 func (f *fakeSigner) Sign(ctx context.Context, blob []byte) ([]byte, error) {
         return []byte("fake signature"), nil
 }