Extreme persistent disk provisioned IOPS recreates disk

[przsab]

Terraform provider removes existing pd-extreme disks every time it is run if provisioned_iops is missing from disk definition.

resource "google_compute_disk" "disk1" {
  name = "disk1"
  type = "pd-extreme"
  size = 1
}

When no updates are made to template, provider replaces the disk during terraform apply because of PIOPS implementation (#8603)

      - provisioned_iops          = 100000 -> null # forces replacement

From the output:

google_compute_disk.disk1: Destroying... [id=projects/project1/zones/us-central1-a/disks/disk1]
google_compute_disk.disk1: Destruction complete after 2s
google_compute_disk.disk1: Creating...
google_compute_disk.disk1: Creation complete after 2s [id=projects/project1 /zones/us-central1-a/disks/disk1]

Using latest provider version over Terraform 0.12.31.

$ terraform version
Terraform v0.12.31
+ provider.google v4.27.0

[github-actions]

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