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Automatic merge from submit-queue rkt: Generate a new Network Namespace for each Pod **What this PR does / why we need it**: This PR concerns the Kubelet with the Container runtime rkt. Currently, when a Pod stops and the kubelet restart it, the Pod will use the **same network namespace** based on its PodID. When the Garbage Collection is triggered, it delete all the old resources and the current network namespace. The Pods and all containers inside it loose the _eth0_ interface. I explained more in details in #45149 how to reproduce this behavior. This PR generates a new unique network namespace name for each new/restarting Pod. The Garbage collection retrieve the correct network namespace and remove it safely. **Which issue this PR fixes** : fix #45149 **Special notes for your reviewer**: Following @yifan-gu guidelines, so maybe expecting him for the final review. **Release note**: `NONE`