Enable VolumeAttributesClass feature gate for CI runs

Author: travisyx

deploy/kubernetes/overlays/prow-stable-sidecar-rc-master/driver-args.yaml

@@ -24,11 +24,5 @@ patchesJson6902:
     kind: Deployment
     name: csi-gce-pd-controller
     version: v1
-- path: driver-args.yaml
-  target:
-    group: apps
-    kind: Deployment
-    name: csi-gce-pd-controller
-    version: v1
 transformers:
 - ../../images/prow-stable-sidecar-rc-master

deploy/kubernetes/overlays/prow-stable-sidecar-rc-master/kustomization.yaml

@@ -120,6 +120,9 @@ fi
 
 if [ "$test_volumeattributesclass" = true ]; then
   base_cmd="${base_cmd} --volumeattributesclass-files=hdb-volumeattributesclass.yaml --storageclass-for-vac-file=sc-hdb.yaml --kube-runtime-config=api/all=true"
+  if [ "$deployment_strategy" = "gce" ]; then
+    base_cmd="${base_cmd} --kube-feature-gates=VolumeAttributesClass=true"
+  fi
 fi
 
 eval "$base_cmd"