provide an ability to mask sensitive info like passwords/keys

[henderiw]

Provide an ability to store a config but mask the sensitive data and leverage secrets in Kubernetes to retrieve the data and substitute the values once deployed to the cluster

[henderiw]

There are different elements to consider here.

1. input in the config CR. Here we will create a reference to a secret which will be used to substitute the data with the information from the secret before sending the data down to the data-server
2. information coming back from running config. We will add some fields in the schema CR to indicate the sensitive paths such that the yang model remains untouched.
3. information in the deviations should also be hidden based on the paths configured in 2.