kube-prometheus: Remove duplicate unused files

afe9711ce2ef5dd0e0b5091f921ae9bc0aab3711 introduced
contrib/kube-prometheus/0prometheus-operator-clusterRole.yaml and
contrib/kube-prometheus/0prometheus-operator-deployment.yaml by mistake.

0prometheus-operator-clusterRole.yaml

-apiVersion: rbac.authorization.k8s.io/v1
-kind: ClusterRole
-metadata:
-  name: prometheus-operator
-rules:
-- apiGroups:
-  - extensions
-  resources:
-  - thirdpartyresources
-  verbs:
-  - '*'
-- apiGroups:
-  - apiextensions.k8s.io
-  resources:
-  - customresourcedefinitions
-  verbs:
-  - '*'
-- apiGroups:
-  - monitoring.coreos.com
-  resources:
-  - alertmanagers
-  - prometheuses
-  - prometheuses/finalizers
-  - alertmanagers/finalizers
-  - servicemonitors
-  - rulefiles
-  verbs:
-  - '*'
-- apiGroups:
-  - apps
-  resources:
-  - statefulsets
-  verbs:
-  - '*'
-- apiGroups:
-  - ""
-  resources:
-  - configmaps
-  - secrets
-  verbs:
-  - '*'
-- apiGroups:
-  - ""
-  resources:
-  - pods
-  verbs:
-  - list
-  - delete
-- apiGroups:
-  - ""
-  resources:
-  - services
-  - endpoints
-  verbs:
-  - get
-  - create
-  - update
-- apiGroups:
-  - ""
-  resources:
-  - nodes
-  verbs:
-  - list
-  - watch
-- apiGroups:
-  - ""
-  resources:
-  - namespaces
-  verbs:
-  - list
-  - watch

0prometheus-operator-deployment.yaml

-apiVersion: apps/v1beta2
-kind: Deployment
-metadata:
-  labels:
-    k8s-app: prometheus-operator
-  name: prometheus-operator
-  namespace: monitoring
-spec:
-  replicas: 1
-  selector:
-    matchLabels:
-      k8s-app: prometheus-operator
-  template:
-    metadata:
-      labels:
-        k8s-app: prometheus-operator
-    spec:
-      containers:
-      - args:
-        - --kubelet-service=kube-system/kubelet
-        - --config-reloader-image=quay.io/coreos/configmap-reload:v0.0.1
-        - --prometheus-config-reloader=quay.io/coreos/prometheus-config-reloader:96d74644
-        - --log-level=all
-        image: quay.io/coreos/prometheus-operator:96d74644
-        name: prometheus-operator
-        ports:
-        - containerPort: 8080
-          name: http
-        resources:
-          limits:
-            cpu: 200m
-            memory: 100Mi
-          requests:
-            cpu: 100m
-            memory: 50Mi
-      nodeSelector:
-        beta.kubernetes.io/os: linux
-      securityContext:
-        runAsNonRoot: true
-        runAsUser: 65534
-      serviceAccountName: prometheus-operator