Make traefik compatible with 1.16.x

Also bump up version to 1.7.19.

Story: 2006853
Task: 37586

Change-Id: Ic91f46f98d07ada0bd4b777ce1409a98e847cf1b

magnum/drivers/common/templates/kubernetes/fragments/enable-ingress-traefik.sh

@@ -48,6 +48,10 @@ metadata:
   labels:
     k8s-app: ingress-traefik-backend
 spec:
+  selector:
+    matchLabels:
+      k8s-app: ingress-traefik-backend
+      name: ingress-traefik-backend
   template:
     metadata:
       labels:

magnum/drivers/k8s_fedora_atomic_v1/templates/kubecluster.yaml

@@ -261,7 +261,7 @@ parameters:
   traefik_ingress_controller_tag:
     type: string
     description: tag of the traefik containers to be used.
-    default: v1.7.10
+    default: v1.7.19
 
   wait_condition_timeout:
     type: number

magnum/drivers/k8s_fedora_coreos_v1/templates/kubecluster.yaml

@@ -261,7 +261,7 @@ parameters:
   traefik_ingress_controller_tag:
     type: string
     description: tag of the traefik containers to be used.
-    default: v1.7.10
+    default: v1.7.19
 
   wait_condition_timeout:
     type: number

releasenotes/notes/traefik-compatible-with-k8s-1-16-9a9ef6d3ccc92fb4.yaml

@@ -0,0 +1,4 @@
+---
+fixes:
+  - |
+    Bump up traefik to 1.7.19 for compatibility with Kubernetes 1.16.x.