fix issue with goimport

Signed-off-by: Victor Vieux <vieux@docker.com>

pkg/mflag/flag_test.go

@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-package mflag_test
+package mflag
 
 import (
 	"bytes"
@@ -12,7 +12,6 @@ import (
 	"strings"
 	"testing"
 	"time"
-	. "github.com/docker/docker/pkg/mflag"
 )
 
 // ResetForTesting clears all flag state and sets the usage function as directed.