SecretKeeper for Google Cloud KMS
SecretKeeper uris are of the form
PROJECT is the google cloud kms
LOCATION is the cloud location; use 'global' for all data centers
KEYRING - your keyring name
KEY - your key name
You also need to set the environment variable GOOGLE_APPLICATION_CREDENTIALS to point to the service account credentials json file.
SecretKeeper implementation that uses Google Cloud KMS for key storage
Options for initializing CloudKmsKeeper.Currently there are no options.