Doc Fix: OpenStack Terraform Contrib README - added missing group_var…

[HauptJ]

Fix: OpenStack Terraform Contrib README - added missing group_vars_path, updated instructions for cloud_provider, and added links to useful resources

• Added setting the $CLUSTER bash variable as part of initial setup
• Add group_vars_path to inventory variables
• Update cloud_provider instructions
• Added relevant links to relevant 3rd party tutorials

What type of PR is this?
kind documentation

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #
#12888

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: HauptJ
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• ✅ login: HauptJ / name: Joshua N Haupt (366242a)

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[k8s-ci-robot]

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[tico88612]

/label ci-short

[tico88612]

/ok-to-test