Some tests in this test suite expects --max-pods (i.e. the maximum pod capacity
on kubelet) to be greater than default, which applies only to the GCE test
environment. Split the tests into two sets so that we can better categorize
the tests in the jenkins setup, without making the test itself aware of the
environment.
This test tracks kubelet resource usage over a long period of time (1hr)
when running N pods (e.g., N=0,50), and prints out the resource usage. This
would give us an idea how much kubelet's management overhead is in a stable
cluster.
Some followup items:
* Use a more realistic workload (e.g., including probing)
* Fail the test if the resource usage is too high.
Caveat:
* We assume the scheduler would do a decent job distributing the pause pods,
but we should double check.
* Cluster addon pods could be unevenly distributed and skews the resource
usage on nodes.
