Add Outputs

[jsosulska]

FEATURE REQUEST

Please provide some output values to assist in bootstrapping Consul when launched.

Example:

• Starter ACL token. This should NOT be the root, but an "admin-like" token that scopes privs to the operator so they can provision other users.
• CA.pem for client Agent configuration
• Retry-join string for clients (Cloud join OR server URL). This helps apply consistent join tags.

Considerations

• Tokens, that would be stored in the TF state. If there is a more secure way to extract this information, please do!
• CA.pem could be uploaded to a secured S3 bucket, or use Cloud HSM, or some other secure route.