Required on vanilla k8s for the olm-hack to create Gateways

Doesn't seem to be a problem on OpenShift due, I think, to the
privileged SCC rule, which wouldn't be in effect on say, minikube.

Interestingly, our knative operators seem to install fine via OLM on
minikube. The Maistra operator will not, as it seems to only work on
OpenShift.

Author: jcrossley3

knative-operators.catalogsource.yaml

@@ -3540,6 +3540,7 @@ data:
                 - networking.istio.io
                 resources:
                 - virtualservices
+                - gateways
                 verbs:
                 - get
                 - list

olm-catalog/knative-serving.v0.3.0.clusterserviceversion.yaml

@@ -192,6 +192,7 @@ spec:
           - networking.istio.io
           resources:
           - virtualservices
+          - gateways
           verbs:
           - get
           - list