install: add service monitor manifest

Author: paulfantom

install/0000_90_cluster-version-operator_00_servicemonitor.yaml

@@ -0,0 +1,18 @@
+apiVersion: monitoring.coreos.com/v1
+kind: ServiceMonitor
+metadata:
+  labels:
+    k8s-app: cluster-version-operator
+  name: cluster-version-operator
+  namespace: openshift-cluster-version
+spec:
+  endpoints:
+  - interval: 30s
+    port: metrics
+    scheme: http
+  namespaceSelector:
+    matchNames:
+    - openshift-cluster-version
+  selector:
+    matchLabels:
+      k8s-app: cluster-version-operator