Merge pull request #2577 from Shopify/e2e-test-namespace-isolation

make sure ingress-nginx instances are watching their namespace only during test runs

test/manifests/ingress-controller/mandatory.yaml

@@ -250,6 +250,7 @@ spec:
             - --udp-services-configmap=$(POD_NAMESPACE)/udp-services
             - --publish-service=$(POD_NAMESPACE)/ingress-nginx
             - --annotations-prefix=nginx.ingress.kubernetes.io
+            - --watch-namespace=${NAMESPACE}
           env:
             - name: POD_NAME
               valueFrom: