Remove obsolete un/deploy scripts for the BackendConfig example/test.

examples/backend-config/deploy.sh

-#! /bin/bash -ex
-
-kubectl apply -f ../hello/cafe.yaml
-
-kubectl apply -f ../hello/cafe-ingress.yaml
-
-kubectl apply -f backend-cfg.yaml

examples/backend-config/undeploy.sh

-#! /bin/bash -ex
-
-MYDIR=$(dirname ${BASH_SOURCE[0]})
-source ${MYDIR}/../../test/utils.sh
-
-kubectl delete -f backend-cfg.yaml
-
-kubectl delete -f ../hello/cafe-ingress.yaml
-
-kubectl delete -f ../hello/cafe.yaml
-
-echo "Waiting until varnish-ingress Pods are not configured for Ingress"
-wait_until_not_configured app=varnish-ingress