This change adds simple utility functions to query kubelet for the resource
usage of major containers (e.g. /kubelet, /docker-daemon, etc) for the past
time interval (up to 2 minutes). This is intended for spot checking of the
recent resource usage on the node.
The test verifies that kubelet deletes the pods/containers within a reasonable
time. It queries the kubelet /runningpods endpoint to retrieve a list of
running pods directly. The outline of the test is:
- Create an RC
- Wait until all pods are running (based on the pod status)
- Verify pods are running by querying the /runningpods
- Delete the RC
- Check all pods are deleted by querying /runningpods
