With this patch the Prometheus Operator checks if there are any
Kubernetes ConfigMaps inside the Prometheus namespace which fullfill the
`Spec.RuleSelector` requirement. If so, it creates a RuleFile for each
key in the `ConfigMap.Spec.Data` map inside the Prometheus namespace.

After modifying prometheus-operator.libsonnet (see commit ec19c16), these are the changes that were made to 0prometheus-operator-clusterRole.yaml by running "make generate".

Add a missing resource to the operator's cluster role allowing it to correctly
manager alertmanagers.

Add a missing 'prometheuses/finalizers' resource to the operator cluster role.
Without this role, the operator will fail to create a default secret for a
Prometheus instance in the absence of any service monitors.

The fix seems to already be present in the `examples` version of the role; this
patch brings the contrib version in line with the example.