Modified node-kubelet-flaky job and image spec

This patch aims to enable the performance benchamrks in the
node-kubelet-flaky e2e job to run on an instance with enough cpu and
memory to run performance workloads.
It also explicitly specifies the `--server-start-timeout` flag to tell
the kubelet how long to wait for healthchecks in between restarts.

Signed-off-by: alejandrox1 <alarcj137@gmail.com>

config/jobs/kubernetes/sig-node/node-kubelet.yaml

@@ -177,8 +177,8 @@ periodics:
       - --deployment=node
       - --gcp-project-type=node-e2e-project
       - --gcp-zone=us-west1-b
-      - --node-args=--image-config-file=/workspace/test-infra/jobs/e2e_node/image-config.yaml
-      - --node-test-args= --kubelet-flags="--cgroups-per-qos=true --cgroup-root=/"
+      - --node-args=--image-config-file=/workspace/test-infra/jobs/e2e_node/perf-image-config.yaml
+      - --node-test-args= --kubelet-flags="--cgroups-per-qos=true --cgroup-root=/" --server-start-timeout=180s
       - --node-tests=true
       - --provider=gce
       - --test_args=--nodes=1 --focus="\[Flaky\]"

jobs/e2e_node/perf-image-config.yaml

@@ -0,0 +1,9 @@
+---
+images:
+  cosbeta-resource1:
+    image: cos-81-12871-103-0
+    project: cos-cloud
+    machine: n1-standard-16
+    metadata: "user-data<test/e2e_node/jenkins/gci-init.yaml,gci-update-strategy=update_disabled"
+    tests:
+      - 'Node Performance Testing'