RFE: Hashicorp Vault - Logging improvements

[amolari]

Refering to: #14
Requesting some enhancements in the logging:

1. client_token is now in the constant, but the request is not logged anymore (which could eventually be an issue for troubleshooting/auditing as we do not have the assessor displayed)

2. we see the role-id in the approle/login response

[shyawnkarim]

Thanks for submitting this issue. We are now tracking this request internally with ID ESECLDTPLT-2828.