Merge pull request #33862 from luxas/remove_experimental_flannel
Automatic merge from submit-queue
Remove the flannel experimental overlay
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**What this PR does / why we need it**:
It removes the deprecated flannel overlay integration in kubelet.
It's completely unnecessary now with CNI which can handle everything smoothly when flannel is running in a daemonset.
**Which issue this PR fixes** *(optional, in `fixes #<issue number>(, #<issue_number>, ...)` format, will close that issue when PR gets merged)*: fixes #17795, #30589
cc @kubernetes/sig-network @thockin @freehan @bprashanth @yujuhong @dchen1107
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