test: strip GPU monitor sidecar from cluster e2e overlay

The GCE cluster e2e jobs now deploy NPD via test/e2e/manifests/deploy-npd.sh,
which kustomize-builds the production deployment/ manifests and waits for the
node-problem-detector DaemonSet to roll out.

This PR's deployment/node-problem-detector.yaml wires in the example GPU
monitor sidecar (gpu-monitor:latest image, NVIDIA host devices, a gRPC socket)
and adds --config.external-monitor on the main container. None of that is
available on the GPU-less GCE e2e nodes: the sidecar image cannot be pulled,
so the DaemonSet never becomes Ready and deploy-npd.sh's rollout wait fails.

Patch the e2e overlay to drop the GPU sidecar, its NVIDIA volumes, and the
--config.external-monitor flag so e2e exercises only the standard system-log
monitors. The production deployment manifest is unchanged.

Signed-off-by: Davanum Srinivas <davanum@gmail.com>

Author: dims

test/e2e/manifests/kustomization.yaml

@@ -10,3 +10,38 @@ images:
 - name: registry.k8s.io/node-problem-detector/node-problem-detector
   newName: gcr.io/k8s-staging-npd/node-problem-detector
   newTag: master
+
+# The production manifest wires in the example GPU monitor sidecar
+# (examples/external-plugins/gpu-monitor): an image NPD does not build, NVIDIA
+# host devices, and a gRPC socket. None of that exists on the GPU-less GCE e2e
+# nodes, so the DaemonSet would never become Ready. Strip the GPU bits here so
+# e2e exercises just the standard system-log monitors; production is unchanged.
+patches:
+- target:
+    group: apps
+    version: v1
+    kind: DaemonSet
+    name: node-problem-detector
+  patch: |-
+    apiVersion: apps/v1
+    kind: DaemonSet
+    metadata:
+      name: node-problem-detector
+    spec:
+      template:
+        spec:
+          containers:
+          - name: node-problem-detector
+            command:
+            - /node-problem-detector
+            - --logtostderr
+            - --config.system-log-monitor=/config/kernel-monitor.json,/config/readonly-monitor.json,/config/docker-monitor.json
+          - name: gpu-monitor
+            $patch: delete
+          volumes:
+          - name: nvidia-dev
+            $patch: delete
+          - name: nvidia-uvm
+            $patch: delete
+          - name: nvidia-ml
+            $patch: delete