retrieve k8s secrets based on label

[romanfurst]

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Desired Outcome

K8S Secret can be retrieved based on "conjur.org/managed-by-provider=true" label defined in it. No need to hardcode k8s secrets names in secret-provider config. Simple removing the label are change to false will ignore the Secret.

Implemented Changes

If no "k8s_secrets" names are defined in config, provider's k8s client get list of secrets base on its label and proces them.

Connected Issue/Story

DRAFT for:

https://github.com/cyberark/secrets-provider-for-k8s/issues/549