The access rules config driver will read a JSON file that represents
rules for accessing service APIs. This is to support application
credential access rules, which will be checked against the configured
rules upon creation. The name for this new API is borrowed from Istio's
near identical concept[1].
[1] https://istio.io/docs/reference/config/authorization/istio.rbac.v1alpha1/#AccessRule
bp whitelist-extension-for-app-creds
Change-Id: If8b9c1e9df55874052dfd9b99fbcea6e06c1ca35