vault: ensure that token revocation is idempotent #7959
Merged
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This ensures that token revocation is idempotent and can handle when
tokens are revoked out of band. Also, on retries, ensure that nomad doesn't extend the token TTL indefinitely.
Idempotency is important to handle some transient failures and retries.
Consider when a single token of a batch fails to be revoked, nomad would
retry revoking the entire batch; tokens already revoked should be
gracefully handled, otherwise, nomad may retry revoking the same
tokens forever.
I've added two tests that fail initially in https://circleci.com/gh/hashicorp/nomad/66794 but pass in the follow up commit.
Fixes #7953