add liveness, readiness and resources in k8s examples

[JorritSalverda]

For the b.gcr.io/endpoints/endpoints-runtime:0.3 container is there an endpoint to test for liveness and/or readiness?

And what resources does it need?

[kyessenov]

For readiness and, perhaps, liveness probe, you can use "/endpoints_status" on the status port, which is 8090 by default:

  readinessProbe:
        httpGet:
          path: /endpoints_status
          port: 8090

Note that /endpoints_status triggers some minimal stats collection, so it's probably better to define another endpoint that just returns 200. We added one by default recently, but it's not released yet.
If you have a custom nginx config, you can also add another location manually.