CM-1112: Fix cluster-monitoring set as annotation instead of label

The openshift.io/cluster-monitoring key was incorrectly set as an
annotation on the cert-manager namespace instead of a label. OpenShift
cluster monitoring requires this to be a label in order to scrape
metrics from the namespace.

Fixes #336

Author: sebrandon1

bindata/cert-manager-deployment/cert-manager-namespace.yaml

@@ -1,6 +1,6 @@
 apiVersion: v1
 kind: Namespace
 metadata:
-  annotations:
+  labels:
     openshift.io/cluster-monitoring: "true"
   name: cert-manager