Add support for a `vsphere_distributed_port_group` data source

[pezhore]

Description

Although we have a resource for creating/manipulating a new distributed port group, there is no data source for retrieving a current distributed port group. This is challenging when attempting to use other resources (e.g. vsphere_entity_permissions) - requiring the end user to find the mo-ref/entity id manually.

The data resource would require a parent distributed virtual switch id and a port group name (used for searching/filtering distributed port groups). For brevity, I chose dvs_id but that could easily be virtualswitch_id or something else that's more robust.

Potential Terraform Configuration

data "vsphere_datacenter" "datacenter" {
  name = "dc1"
}

data "vsphere_distributed_virtual_switch" "dvs" {
  name          = "terraform-test-dvs"
  datacenter_id = data.vsphere_datacenter.datacenter.id
}

data "vsphere_distributed_port_group" "my-dvpg" {
 name   = "terraform-test-dvpg"
 dvs_id = data.vspherer_distributed_virtual_switch.dvs.id
}

References

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[cerrakoth]

To add colour to why this would be useful - We would like to start deploying VMs via Terraform in an environment which already contains distributed port groups. We currently would need to create a new dpg managed by Terraform or import the existing dpg to the state which is not an optimal way of doing this.