Update dependencies

Among others, this updates minio-go, so that the new "eu-west-3" zone
for AWS is supported.

vendor/cloud.google.com/go/spanner/go18.go

@@ -0,0 +1,66 @@
+// Copyright 2017 Google Inc. All Rights Reserved.
+//
+// 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,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build go1.8
+
+package spanner
+
+import (
+	"fmt"
+
+	ocgrpc "go.opencensus.io/plugin/grpc"
+	"go.opencensus.io/trace"
+	"golang.org/x/net/context"
+	"google.golang.org/api/option"
+	"google.golang.org/grpc"
+)
+
+func openCensusOptions() []option.ClientOption {
+	return []option.ClientOption{
+		option.WithGRPCDialOption(grpc.WithStatsHandler(ocgrpc.NewClientStatsHandler())),
+	}
+}
+
+func traceStartSpan(ctx context.Context, name string) context.Context {
+	return trace.StartSpan(ctx, name)
+}
+
+func traceEndSpan(ctx context.Context, err error) {
+	span := trace.FromContext(ctx)
+	if err != nil {
+		span.SetStatus(trace.Status{Message: err.Error()})
+	}
+	trace.EndSpan(ctx)
+}
+
+func tracePrintf(ctx context.Context, attrMap map[string]interface{}, format string, args ...interface{}) {
+	var attrs []trace.Attribute
+	for k, v := range attrMap {
+		var a trace.Attribute
+		switch v := v.(type) {
+		case string:
+			a = trace.StringAttribute{k, v}
+		case bool:
+			a = trace.BoolAttribute{k, v}
+		case int:
+			a = trace.Int64Attribute{k, int64(v)}
+		case int64:
+			a = trace.Int64Attribute{k, v}
+		default:
+			a = trace.StringAttribute{k, fmt.Sprintf("%#v", v)}
+		}
+		attrs = append(attrs, a)
+	}
+	trace.FromContext(ctx).Annotatef(attrs, format, args...)
+}