Fix an e2e test when the deployment method is kubectl.

The replica scaling test for self-sharding requires the Deployment
name "varnish-ingress" for the viking service.

deploy/varnish.yaml

 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  name: varnish
+  name: varnish-ingress
 spec:
   replicas: 2
   selector:

deploy/varnish_klarlack.yaml

 apiVersion: apps/v1
 kind: Deployment
 metadata:
-  name: varnish
+  name: varnish-ingress
 spec:
   replicas: 2
   selector: