New data source that returns multiple VMs

[neil-wwt]

The current data source for VMs (nsxt_policy_vm) only allows for returning attributes about a single VM.

It would be really useful if there was a data source that returned a list of VMs similar to the aws_instances data source.

The arguments for this data source would need more capabilities like pattern matching or filters of course.

Suggested Example

data "nsxt_policy_vms" "ubuntu_vms" {
  filter {
    OS = "Ubuntu"
    display_name = "web*"
  }
}

This would return all VMs with an Ubuntu OS and a name that starts with web (regex patterns would be really great here)

Then from this you could do something like apply a tag to each VM using its instance ID

resource "nsxt_policy_vm_tags" "web_servers" {
  for_each = data.nsxt_policy_vms.ubuntu_vms.instance_ids
  instance_id = each.value

  tag {
    tag   = "Web"
  }
}

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[annakhm]

Filtering by state and guest_os was added for nsxt_policy_vms in #869
Sorry it took such a long time!