Move to vendor

Signed-off-by: Olivier Gambier <olivier@docker.com>

vendor/google.golang.org/cloud/internal/opts/option.go

@@ -0,0 +1,24 @@
+// Package opts holds the DialOpts struct, configurable by
+// cloud.ClientOptions to set up transports for cloud packages.
+//
+// This is a separate page to prevent cycles between the core
+// cloud packages.
+package opts
+
+import (
+	"net/http"
+
+	"golang.org/x/oauth2"
+	"google.golang.org/grpc"
+)
+
+type DialOpt struct {
+	Endpoint  string
+	Scopes    []string
+	UserAgent string
+
+	TokenSource oauth2.TokenSource
+
+	HTTPClient *http.Client
+	GRPCClient *grpc.ClientConn
+}