TestContainerStopTimeout: fix

The unit test is checking that setting of non-default StopTimeout
works, but it checked the value of StopSignal instead.

Amazingly, the test was working since the default StopSignal is SIGTERM,
which has the numeric value of 15.

Fixes: commit e66d21089 ("Add config parameter to change ...")
Signed-off-by: Kir Kolyshkin <kolyshkin@gmail.com>

container/container_unit_test.go

@@ -52,9 +52,9 @@ func TestContainerStopTimeout(t *testing.T) {
 	c = &Container{
 		Config: &container.Config{StopTimeout: &stopTimeout},
 	}
-	s = c.StopSignal()
-	if s != 15 {
-		t.Fatalf("Expected 15, got %v", s)
+	s = c.StopTimeout()
+	if s != stopTimeout {
+		t.Fatalf("Expected %v, got %v", stopTimeout, s)
 	}
 }