Merge pull request #61311 from k82cn/k8s_61050_1

Automatic merge from submit-queue. If you want to cherry-pick this change to another branch, please follow the instructions <a href="https://github.com/kubernetes/community/blob/master/contributors/devel/cherry-picks.md">here</a>.

Added network-unavailable tolerations when hostNetwork=true.

Signed-off-by: Da K. Ma <klaus1982.cn@gmail.com>

**Which issue(s) this PR fixes** *(optional, in `fixes #<issue number>(, fixes #<issue_number>, ...)` format, will close the issue(s) when PR gets merged)*:
Fixes #61050 

**Release note**:
```release-note
None
```

cluster/addons/metadata-proxy/gce/metadata-proxy.yaml

@@ -37,6 +37,11 @@ spec:
       serviceAccountName: metadata-proxy
       hostNetwork: true
       dnsPolicy: Default
+      tolerations:
+      - operator: "Exists"
+        effect: "NoExecute"
+      - operator: "Exists"
+        effect: "NoSchedule"
       containers:
       - name: metadata-proxy
         image: k8s.gcr.io/metadata-proxy:v0.1.9