Add sample settings for authenticator validator host IDs

[diverdane]

Is your feature request related to a problem? Please describe.

PR #140 for the conjurdemos/kubernetes-conjur-demo scripts repo adds support for 2 "validator" host IDs in Conjur policy that can be used to validate Conjur authentication e.g. after a Kubernetes cluster or a Kubernetes Namespace has been configured to support Conjur authn-k8s.

This change adds sample settings for configuring these authenticator validator host IDs to the customize.env file for the Kubernetes-in-Docker application deployment example.

Describe the solution you would like

Sample settings for configuring authenticator validator host IDs are included in the customize.env file for the Kubernetes-in-Docker application deployment example.

Describe alternatives you have considered

Additional context

[diverdane]

Closing this Issue since the config "knobs" that are being proposed should never be needed for this demo. Anyone using this demo will be able to use the default validator IDs that are implemented in kubernetes-conjur-demo.