google_compute_interconnect_attachment: add support for MTU

[lancekett]

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Description

We would like to be able to manage the MTU field for interconnect attachments
These are available fields in the REST API resource, as well as the cloud sdk:
--mtu

The existing terraform resource does not include these fields in the code or the documentation.

New or Affected Resource(s)

• google_compute_interconnect_attachment

Potential Terraform Configuration

resource "google_compute_interconnect_attachment" "default" {
  name              = "on-prem-interconnect"
  interconnect      = "my-interconnect-id"
  router            = google_compute_router.foobar.id
  mtu               = "1500"
}

References

The REST API documentation for the resource specifies the fields and their accepted values here: https://cloud.google.com/compute/docs/reference/rest/v1/interconnectAttachments

This request is similar to #4109, but for different fields.

• b/179510449

[vabagaria]

This is a good workaround while waiting for provider update:

resource "null_resource" "attachment_mtu_mod" {
  depends_on = [ google_compute_interconnect_attachment.attachment ]

  provisioner "local-exec" {
    command = "gcloud compute interconnects attachments {$var.type} update ${var.name} --mtu=1500 --region=${var.region} --project=${var.project}"
  }
}

[ghost]

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