Add support for Consul secrets engine enhancements

[robmonte]

This adds supports for service identities and node identities in Consul and for the ability to bootstrap the Consul ACL system by writing the secrets engine config without a token.

Bootstrapping example:

resource "vault_consul_secret_backend" "config" {
  path    = "consul"
  address = "http://127.0.0.1:8500"
}

Identities example:

resource "vault_consul_secret_backend_role" "role" {
  name               = "management"
  backend            = vault_consul_secret_backend.config.path
  node_identities    = ["server-1:dc1"]
  service_identities = ["db-service:dc1"]
}

Community Note

• Please vote on this pull request by adding a 👍 reaction to the original pull request comment to help the community and maintainers prioritize this request
• Please do not leave "+1" comments, they generate extra noise for pull request followers and do not help prioritize the request

Release note for CHANGELOG:

IMPROVEMENTS
* resource/vault_consul_secret_backend: Try automatically bootstrapping the Consul ACL system when a token is not provided
* resource/vault_consul_secret_backend_role: Add support for service identities and node identities

Output from acceptance testing:

$ make testacc TESTARGS='-run=TestConsulSecretBackendRole'
=== RUN   TestConsulSecretBackendRole
--- PASS: TestConsulSecretBackendRole (2.17s)
=== RUN   TestConsulSecretBackendRoleNameFromPath
--- PASS: TestConsulSecretBackendRoleNameFromPath (0.00s)
=== RUN   TestConsulSecretBackendRoleBackendFromPath
--- PASS: TestConsulSecretBackendRoleBackendFromPath (0.00s)
PASS

[austingebauer]

LGTM otherwise.

[benashz]

Looking good. I added a few comments/suggestions. Also I think we need to update the website docs.

[benashz]

Looks like the build is failing when testing against Vault-1.10, we will probably need special case some of the tests to account for feature differences between 1.10 and 1.11.

[vinay-gopalan]

Awesome work! Couple of nits and questions but PR is looking great

[benashz]

LGTM!

[robmonte]

Thanks for all of the help!!