Support Getting Consul ACL Token From Vault

[seanmalloy]

Need the ability to get a dynamic Consul ACL token from Hashicorp Vault, so that the token no longer needs to be in the config file. Would like the authenticate to Vault using Kubernetes authentication.

What happens?

The Consul ACL token is static and in plain text in a config file.

What were you expecting to happen?

Leverage Hashicorp Vault to dynamically get a Consul ACL token.

Steps to reproduce:

N/A

Any errors, stacktrace, logs?

N/A

Environment:

• Go 1.12
• Desktop OS/version: Linux

Additional comments:

https://www.vaultproject.io/docs/auth/kubernetes.html
https://www.vaultproject.io/docs/secrets/consul/index.html