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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