Before #260, the Prometheus name and number of replicas could be
configured in `_config.prometheus.name` and
`_config.prometheus.replicas` respectively.
It isn't the case anymore, which means that configurations that did set
a custom name for Prometheus will get a second Prometheus instance
called `k8s` when they upgrade kube-prometheus.
This commit adds back the ability to configure both of these parameters
in `_config`.
Since #132, `kube-rbac-proxy` resources can be configured in
`config.resources['kube-rbac-proxy']`, but the node-exporter daemonset
was still using hard-coded values.
This commit sets the request and limit resources to the configured
values for the `kube-rbac-proxy` container in the node-exporter pods.
Benoît Knecht
