Update APIs to use new Google cloud paths.

grpc/discovery/service.pb.go

 // Code generated by protoc-gen-go.
 // source: github.com/luci/luci-go/grpc/discovery/service.proto
 // DO NOT EDIT!
 
 /*
 Package discovery is a generated protocol buffer package.
 
 It is generated from these files:
         github.com/luci/luci-go/grpc/discovery/service.proto
 
 It has these top-level messages:
         Void
         DescribeResponse
 */
 package discovery
 
 import prpc "github.com/luci/luci-go/grpc/prpc"
 
 import proto "github.com/golang/protobuf/proto"
 import fmt "fmt"
 import math "math"
-import google_protobuf "github.com/luci/luci-go/common/proto/google/descriptor"
+import google_protobuf "google.golang.org/genproto/protobuf"
 
 import (
         context "golang.org/x/net/context"
         grpc "google.golang.org/grpc"
 )
 
 // Reference imports to suppress errors if they are not otherwise used.
 var _ = proto.Marshal
 var _ = fmt.Errorf
 var _ = math.Inf
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 }