Allow change default endpoint for server join in case of aws

[obeyler]

Proposal

Nomad allows to join cluster by using tag on aws vm instance. (https://www.nomadproject.io/docs/configuration/server_join) In case of AWS cloud provider, unfortunately the default endpoint can not be set.

Use-cases

Sometime default aws endpoint have to be change (example in case of outscale cloud provider who share same api with aws but differs from endpoint: https://docs.outscale.com/en/userguide/Regions-Endpoints-and-Availability-Zones-Reference.html)

Attempted Solutions

I make a PR hashicorp/go-discover#194 on go-discover who give this opportunity.
If you can validate this PR and update to the new go-discover inside nomad...

[Amier3]

Hey @obeyler

Thanks for making this and the associated PR . We'll keep the discussions for this on the PR

[obeyler]

The associated PR is merged

[github-actions]

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