Add support for including/excluding resource pools by cluster

[atc0005]

Overview

Similar to the work on #809 or #882, we can add support for including/excluding resource pools by cluster in order to prevent evaluating resources running outside of an intended cluster in the same datacenter.

Context

I recently encountered a scenario where a new offsite host (ComputeResource) was added to an existing vSphere Datacenter that was not made part of the same existing cluster (ClusterComputeResource). This added another "parent" resource pool to the mix also named Resources.

Datacenter (ExampleDC)
	- Hosts & Clusters (hostFolder property)
		- HostSystem (192.168.2.200)
		- Cluster (XYZ-Hosted)

If we try to exclude the Resources pool by name we could end up matching both the Resources pool in the cluster and the Resources pool associated with the new non-clustered host.

Once support is available for filtering based on ResourcePool Managed Object ID (MOID) we can reliably exclude the host-based Resources pool based on a MOID, but once support is available for filtering based on a cluster value we can limit evaluation to just that cluster (or exclude the cluster entirely).

This can be considered a more fine-grained control than what is to be added by #882.

References

• Add support for excluding/ignoring VMs by Folder Managed Object ID (MOID) #809
• Add support for including/excluding resource pools by Managed Object ID (MOID) #882
• https://vdc-download.vmware.com/vmwb-repository/dcr-public/a5f4000f-1ea8-48a9-9221-586adff3c557/7ff50256-2cf2-45ea-aacd-87d231ab1ac7/vim.ComputeResource.html
• https://vdc-download.vmware.com/vmwb-repository/dcr-public/a5f4000f-1ea8-48a9-9221-586adff3c557/7ff50256-2cf2-45ea-aacd-87d231ab1ac7/vim.ClusterComputeResource.html
• https://vdc-download.vmware.com/vmwb-repository/dcr-public/a5f4000f-1ea8-48a9-9221-586adff3c557/7ff50256-2cf2-45ea-aacd-87d231ab1ac7/vim.Datacenter.html

[atc0005]

It might also be useful to provide a flag that toggles "evaluate resource pools from clusters only" behavior.