Add scale-from-zero example

[d-uzlov]

Fixes #1328

[denis-tingaikin]

Looks good, added few comments

[denis-tingaikin]

Looks good, added few comments

[denis-tingaikin]

Added few comments to make the example clear for folks :)

[denis-tingaikin]

Why do we need to wait?

[d-uzlov]

On a fresh cluster start of the pods can time quite long time. If we don't wait, subsequent commands will fail.

[denis-tingaikin]

we have a prefetch for this. This should not affect the test.

[d-uzlov]

All of the other tests have wait till pods are ready. Are you sure it's safe to remove the wait?
Also, if someone replicates this example manually, they will have to wait manually until all the images are downloaded.

This wait doesn't increase duration of the test. If we already have everything in the cache, and pods started immediately, kubectl wait --for=condition=ready will return without any delay.

[denis-tingaikin]

Suggested change

	Wait for applications ready:
	```bash
	kubectl wait --for=condition=ready --timeout=1m pod -l app=nse-icmp-responder -n ${NAMESPACE}
	```