openstack: Fix a crash in the bootstrapper during node join discovery

[3u13r]

Context

The bootstrapper still likes to query any nodes in addition to the LB endpoint when searching for join endpoints.

Openstack has a catalog discovery feature that gets URL endpoints during authentication (see: https://github.com/jtopjian/gophercloud/blob/master/openstack/endpoint_location.go#L63). Since we did not set the region we received more endpoints than expected and some even invalid ones.

Proposed change(s)

• Passthrough openstack region name via IMDS to instance to use it in the cloud API client.

Checklist

• [x] Add labels (e.g., for changelog category)
• [x] Is PR title adequate for changelog?
• [x] Link to Milestone

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[3u13r]

I also not remember the actual crash location. I'll spin up a cluster to document this more thoroughly.