This commit enables Slurm clusters and VMs to use Managed Lustre instances originally configured for compatibility with GKE. Because Lustre and GKE use port 988 by default, Managed Lustre has a GKE-compatibility mode which adopts port 6988.

---
blueprint_name: test-lustre-port

vars:
  deployment_name: pr-4210
  region: us-central1
  zone: us-central1-c

deployment_groups:
- group: primary
  modules:
  - id: network
    source: modules/network/vpc
  - id: s0
    source: modules/scripts/startup-script
  - id: s1
    source: modules/scripts/startup-script
    settings:
      managed_lustre:
        # removing the explicit true should fail the validation block
        enabled: true
        port: 6998
  - id: vm0
    source: modules/compute/vm-instance
    use:
    - network
    - s0
    settings:
      machine_type: n2-standard-8
      name_prefix: vm0
  - id: vm1
    source: modules/compute/vm-instance
    use:
    - network
    - s1
    settings:
      machine_type: n2-standard-8
      name_prefix: vm1

On vm0, no changes are observed and Ansible is not installed. On vm1, the changes below are observed and Ansible is installed. Both are WAI.

[ext_tpdownes_google_com@vm1-0 modprobe.d]$ cat lnet.conf 
options lnet accept_port=6998

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