Dataproc - March 26th, 2019 [Feature]

## Feature * Announcing the [Alpha](https://cloud.google.com/products/#product-launch-stages) release of Cloud Dataproc [Component Gateway](https://cloud.google.com/dataproc/docs/concepts/accessing/dataproc-gateways), which provides secure access to web endpoints for Cloud Dataproc core and optional components without relying on SSH tunnels or modifying firewall rules to allow inbound traffic (applies to clusters created with image version 1.3.29 and later). **Note:** Currently, the Component Gateway feature is not available in the `europe-west6` [region](https://cloud.google.com/compute/docs/regions-zones/regions-zones#available) (Zürich, Switzerland).