Fix goimport group

Signed-off-by: hanjm <hanjinming@outlook.com>

test/e2e/tools_bucket_web_test.go

@@ -20,9 +20,9 @@ import (
 	"github.com/go-kit/kit/log"
 	"github.com/prometheus/prometheus/pkg/labels"
 	"github.com/prometheus/prometheus/pkg/timestamp"
+
 	v1 "github.com/thanos-io/thanos/pkg/api/blocks"
 	"github.com/thanos-io/thanos/pkg/objstore"
-
 	"github.com/thanos-io/thanos/pkg/objstore/client"
 	"github.com/thanos-io/thanos/pkg/objstore/s3"
 	"github.com/thanos-io/thanos/pkg/testutil"