[BUG] vcsim does not answer govc find after deleting a resource pool which had a child resource pool

[chrischdi]

Describe the bug
A clear and concise description of what the bug is.

To Reproduce
Steps to reproduce the behavior:

1. govc pool.create /DC0/host/DC0_C0/Resources/foo
2. govc pool.create /DC0/host/DC0_C0/Resources/foo/bar
3. govc find -l /DC0/host/DC0_C0/Resources
4. govc pool.destroy /DC0/host/DC0_C0/Resources/foo
5. govc find -l /DC0/host/DC0_C0/Resources

govc command will be stuck forever and not return or exit.

Expected behavior
Find returns the list of still existing objects.

Affected version

❯ govc version
govc 0.36.2

❯ vcsim version
Build Version: 0.36.2
Build Commit: f2a87d75
Build Date: 2024-03-27T04:34:21Z

Screenshots/Debug Output
If applicable, add screenshots or debug output to help explain your problem.

Additional context

This command still works after govc pool.destroy /DC0/host/DC0_C0/Resources/foo:

❯ govc ls '/DC0/host/DC0_C0/Resources/*'
/DC0/host/DC0_C0/Resources/bar

The same happens when using govc object.destroy.

It does not happen for folders.

[chrischdi]

Unittest which could get used in simulator/finder_test.go for reproduction:

func TestFinderDestroyedParentResourcePool(t *testing.T) {
	ctx := context.Background()

	m := VPX()
	m.Datacenter = 3
	m.Folder = 2
	m.Pool = 1

	defer m.Remove()

	err := m.Create()
	if err != nil {
		t.Fatal(err)
	}

	s := m.Service.NewServer()
	defer s.Close()

	client, err := govmomi.NewClient(ctx, s.URL, true)
	if err != nil {
		t.Fatal(err)
	}

	finder := find.NewFinder(client.Client, false)
	dc, _ := finder.Datacenter(ctx, "/F0/DC1")
	finder.SetDatacenter(dc)

	rp, err := finder.ResourcePool(ctx, "/DC0/host/DC0_C0/Resources")
	if err != nil {
		t.Fatal(err)
	}

	foo, err := rp.Create(ctx, "foo", types.DefaultResourceConfigSpec())
	if err != nil {
		t.Fatal(err)
	}

	bar, err := foo.Create(ctx, "bar", types.DefaultResourceConfigSpec())
	if err != nil {
		t.Fatal(err)
	}

	task, err := foo.Destroy(ctx)
	if err != nil {
		t.Fatal(err)
	}
	if err := task.WaitEx(ctx); err != nil {
		t.Fatal(err)
	}

	if _, err := finder.Element(ctx, bar.Reference()); err != nil {
		t.Fatal(err)
	}
}

[dougm]

Thank you @chrischdi for the test cases to reproduce, fix opened for review #3399