Update APIs to use new Google cloud paths.

logdog/common/storage/bigtable/bigtable_test.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 (
         "testing"
         "time"
 
+        "cloud.google.com/go/bigtable"
         "github.com/luci/luci-go/common/errors"
         "github.com/luci/luci-go/logdog/common/storage"
         "golang.org/x/net/context"
-        "google.golang.org/cloud/bigtable"
 
         . "github.com/smartystreets/goconvey/convey"
 )
 
 func TestBigTable(t *testing.T) {
         t.Parallel()
 
         Convey(`Testing BigTable internal functions`, t, func() {
                 var bt btTableTest
                 defer bt.close()
@@ skipping 51 matching lines @@
                         })
 
                         Convey(`With return an error if the configuration fails to apply.`, func() {
                                 bt.err = errors.New("test error")
 
                                 So(s.Config(cfg), ShouldEqual, bt.err)
                         })
                 })
         })
 }