kind: Add a shorter timeout instead of default 30 seconds for kindnetd listing nodes to speed up control-plane ready

What would you like to be added: Add a timeout for https://github.com/kubernetes-sigs/kind/blob/21c1d2e5b25e71234f3b30eceae97f03df98787a/images/kindnetd/cmd/kindnetd/main.go#L107 Else kindnet would be timed out for 30 seconds in first time leading 30-seconds slower for control-plane node to be ready Why is this needed: I have a ci using kind to deploy k8s environment, I want to make control-plane node to be ready quickly.

Environment:

• kind version: (use kind version): kind v0.10.0-alpha go1.15.6 linux/amd64