cert-manager: Upgrade to 0.4.1

Upstream Changes:

-   cert-manager 0.4.1 (https://github.com/jetstack/cert-manager/releases/tag/v0.4.1)

Our Changes:

-   Better templates sync with upstream manifests
-   Remove fancy resources requests/limits customization

roles/kubernetes-apps/ingress_controller/cert_manager/templates/deploy-cert-manager.yml.j2

@@ -6,19 +6,19 @@ metadata:
   namespace: {{ cert_manager_namespace }}
   labels:
     app: cert-manager
-    chart: cert-manager-v0.4.0
+    chart: cert-manager-v0.4.1
     release: cert-manager
     heritage: Tiller
 spec:
   replicas: 1
   selector:
     matchLabels:
-      k8s-app: cert-manager
+      app: cert-manager
       release: cert-manager
   template:
     metadata:
       labels:
-        k8s-app: cert-manager
+        app: cert-manager
         release: cert-manager
       annotations:
     spec:
@@ -37,8 +37,5 @@ spec:
                   fieldPath: metadata.namespace
           resources:
             requests:
-              cpu: {{ cert_manager_cpu_requests }}
-              memory: {{ cert_manager_memory_requests }}
-            limits:
-              cpu: {{ cert_manager_cpu_limits }}
-              memory: {{ cert_manager_memory_limits }}
+              cpu: 10m
+              memory: 32Mi