Currently this uses the combined kubelet output (stdout + stderr), but this
causes parsing issues if the kubelet logs something on stderr.
Thus we ignore the entire stderr and use stdout only.
We do disable a couple of tests here. That is because the fakeexecer only
supports combined output and return a "not supported" error if `.Output()`
gets invoked thus permanently failing those.
Signed-off-by: Rostislav M. Georgiev <rostislavg@vmware.com>
