tests: avoid early shutdown of sandbox

Because sandbox is closed down when the main test
that created the sandbox returns it can't have subtests
that set themselves as parallel as they would continue
to run in a different lifecycle.

Signed-off-by: Tonis Tiigi <tonistiigi@gmail.com>

tests/dialstdio.go

@@ -113,13 +113,10 @@ func testDialStdio(t *testing.T, sb integration.Sandbox) {
 		require.Equal(t, "world", string(dt))
 	}
 
-	t.Run("conn=netpipe", func(t *testing.T) {
-		t.Parallel()
-		do(t, func(t *testing.T, cmd *exec.Cmd) net.Conn {
-			c1, c2 := net.Pipe()
-			cmd.Stdin = c1
-			cmd.Stdout = c1
-			return c2
-		})
+	do(t, func(t *testing.T, cmd *exec.Cmd) net.Conn {
+		c1, c2 := net.Pipe()
+		cmd.Stdin = c1
+		cmd.Stdout = c1
+		return c2
 	})
 }