This changes the default image for kube-state-metrics to use the
bitnami image instead of the coreos image. This allows us to
override the image entrypoint, as the Alpine based image used
previously did not easily allow us to do so. Adding this also
makes creating a common prometheus exporter deployment template
easier, as it reduces the functional differences between exporter
charts and templates
Change-Id: I6c4aac36f563fcb15f52640bc6f9913b45b4358a
5fe73e6e58