*: bump Prometheus to v2.0.0-rc.1

assets/prometheus/rules/alertmanager.rules

assets/prometheus/rules/alertmanager.rules.yaml

assets/prometheus/rules/etcd3.rules

assets/prometheus/rules/etcd3.rules.yaml

assets/prometheus/rules/general.rules

assets/prometheus/rules/general.rules.yaml

assets/prometheus/rules/kube-apiserver.rules

assets/prometheus/rules/kube-apiserver.rules.yaml

assets/prometheus/rules/kube-controller-manager.rules

assets/prometheus/rules/kube-controller-manager.rules.yaml

assets/prometheus/rules/kube-scheduler.rules

assets/prometheus/rules/kube-scheduler.rules.yaml

assets/prometheus/rules/kubelet.rules

assets/prometheus/rules/kubelet.rules.yaml

assets/prometheus/rules/kubernetes.rules

assets/prometheus/rules/kubernetes.rules.yaml

assets/prometheus/rules/node.rules

assets/prometheus/rules/node.rules.yaml

assets/prometheus/rules/prometheus.rules

assets/prometheus/rules/prometheus.rules.yaml