[Release 0.3.3]

Added

• Adds ability for users to specify base image for etcd pods in a cluster. Default base image is quay.io/coreos/etcd-operator.

Fixed

• [GH-1138] Fixed operator stucks in managing selfhosted cluster when there are not enough nodes to start new etcd member.
• [GH-1196] Fixed etcd operator could not start S3 backup sidecar if given non-root user.