[Windows][Integration] Enable TestRestartMonitor

With the release of hcsshim v0.9.2, this test should pass without
issues on Windows.

Signed-off-by: Gabriel Adrian Samfira <gsamfira@cloudbasesolutions.com>

integration/client/restart_monitor_test.go

@@ -125,13 +125,6 @@ func newDaemonWithConfig(t *testing.T, configTOML string) (*Client, *daemon, fun
 // TestRestartMonitor tests restarting containers
 // with the restart monitor service plugin
 func TestRestartMonitor(t *testing.T) {
-	if runtime.GOOS == "windows" {
-		// This test on Windows encounters the following error in some environments:
-		// "The process cannot access the file because it is being used by another process. (0x20)"
-		// Skip this test until this error can be evaluated and the appropriate
-		// test fix or environment configuration can be determined.
-		t.Skip("Skipping flaky test on Windows")
-	}
 	const (
 		interval = 10 * time.Second
 		epsilon  = 1 * time.Second
@@ -188,10 +181,24 @@ version = 2
 		t.Fatal(err)
 	}
 
+	statusC, err := task.Wait(ctx)
+	if err != nil {
+		t.Fatal(err)
+	}
+
 	if err := task.Kill(ctx, syscall.SIGKILL); err != nil {
 		t.Fatal(err)
 	}
 
+	// Wait for task exit. If the task takes longer to exit, we risc
+	// wrongfully determining that the task has been restarted when we
+	// check the status in the for loop bellow and find that it's still
+	// running.
+	select {
+	case <-statusC:
+	case <-time.After(30 * time.Second):
+	}
+
 	begin := time.Now()
 	lastCheck := begin