NewRDSClient loads AWS Config and creds, and returns an RDS client.

NewRedshiftClient loads AWS Config and creds, and returns an Redshift client.

DBInstanceResult is wrapper around a DBInstance or error as a result of listing RDS Instances.

RedshiftClusterResult is wrapper around a DBInstance or error as a result of listing Redshift cluster.

RDSClient is our wrapper around the RDS library, allows us to mock this for testing.

RedshiftClient is our wrapper around the Redshift library, allows us to mock this for testing.