Merge pull request #28516 from Random-Liu/disable-cni-for-local-node-e2e

Automatic merge from submit-queue

Node E2E: Disable kubenet for local node e2e test.

After https://github.com/kubernetes/kubernetes/pull/28196, we must manually setup cni and nsenter in local node to run `make test_e2e_node`, which may not be necessary for local development.

I've tried to move cni downloading logic into `BeforeSuite`, however it is still hard to figure out who should install nsenter, manually installed by every developer? in the `setup_host.sh` script? in `BeforeSuite`?

This PR:
* Added a flag to disable kubenet and disabled kubenet in local test.
* Cleaned up the CNI installation logic a bit.

/cc @yujuhong @freehan 
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hack/verify-flags/known-flags.txt

@@ -100,6 +100,7 @@ deployment-label-key
 deserialization-cache-size
 dest-file
 disable-filter
+disable-kubenet
 dns-port
 dns-provider
 dns-provider-config