Use 2 seconds instead of  2000 milliseconds
@@ -426,7 +426,7 @@ func (s *DockerExternalVolumeSuite) TestExternalVolumeDriverRetryNotImmediatelyE
<-started
// wait for a retry to occur, then create spec to allow plugin to register
- time.Sleep(2000 * time.Millisecond)
+ time.Sleep(2 * time.Second)
p := newVolumePlugin(c, driverName)
defer p.Close()
