hydrate-cluster and bootstrap systemd vault policy format drift

[johnalotoski]

Since commit 81a576e, anytime the bootstrap core node is deployed with a change and then a TF hydrate-cluster plan is performed afterwards there will be at least a minimal no-op TF plan diff due to bootstrap script declaring vault policies in hcl format and hydrate-cluster declaring vault policies in json. Bringing the syntax to the same format for both methods should resolve -- likely the preference is to bring the bootstrap scripts to use json.

[kaii-zen]

Are you already working on this? If not then I can pick it up. Shouldn't be too hard.