Update APIs to use new Google cloud paths.

logdog/common/storage/bigtable/bigtable.go

 // Copyright 2015 The LUCI Authors. All rights reserved.
 // Use of this source code is governed under the Apache License, Version 2.0
 // that can be found in the LICENSE file.
 
 package bigtable
 
 import (
         "fmt"
         "time"
 
+        "cloud.google.com/go/bigtable"
         "github.com/luci/luci-go/grpc/grpcutil"
         "github.com/luci/luci-go/logdog/common/storage"
         "golang.org/x/net/context"
-        "google.golang.org/cloud/bigtable"
 )
 
 const (
         logColumnFamily = "log"
 
         // The data column stores raw low row data (RecordIO blob).
         logColumn  = "data"
         logColName = logColumnFamily + ":" + logColumn
 )
 
@@ skipping 149 matching lines @@
 
         // Get the specific ReadItem for our column
         colName := fmt.Sprintf("%s:%s", family, column)
         for _, item := range items {
                 if item.Column == colName {
                         return &item
                 }
         }
         return nil
 }