remove cert-manager-clusterissuer

Ref: kops-registry#31 (comment 8116142)

templates/cert-manager-clusterIssuer.yaml

-{{- if index .Values "cert-manager" "enabled" }}
----
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: letsencrypt
-  namespace: kube-system
-spec:
-  acme:
-    # The ACME server URL
-    server:  https://acme-v02.api.letsencrypt.org/directory
-    # Email address used for ACME registration
-    email: no-reply@cern.ch
-    # Name of a secret used to store the ACME account private key
-    privateKeySecretRef:
-      name: letsencrypt
-    # Enable the HTTP-01 challenge provider
-    solvers:
-    - http01:
-        ingress:
-          {{- if index .Values "ingress-nginx" "enabled" }}
-          class: nginx
-          {{- else }}
-          class: traefik
-          {{- end }}
----
-apiVersion: cert-manager.io/v1
-kind: ClusterIssuer
-metadata:
-  name: letsencrypt-staging
-  namespace: kube-system
-spec:
-  acme:
-    # The ACME server URL
-    server: https://acme-staging-v02.api.letsencrypt.org/directory
-    # Email address used for ACME registration
-    email: no-reply@cern.ch
-    # Name of a secret used to store the ACME account private key
-    privateKeySecretRef:
-      name: letsencrypt-staging
-    # Enable the HTTP-01 challenge provider
-    solvers:
-    - http01:
-        ingress:
-          {{- if index .Values "ingress-nginx" "enabled" }}
-          class: nginx
-          {{- else }}
-          class: traefik
-          {{- end }}
-{{- end }}
-
-