89fc4e306972604eba2dcb961a6d29cc27a668ad introduced the new Prometheus
rule file custom resource definition. This patch adjusts the
kube-prometheus project to use the new custom resource definition.
Since PR 460 [1] the Prometheus Operator is using Kubernetes Custom Resource
Definitions instead of Kubernetes Third Party Resources. Permissions to
handle Third Party Resources in the RBAC rules of the Prometheus
Operator is thereby obsolete.
[1] https://github.com/coreos/prometheus-operator/pull/460