Collect logs for dead kubelets too
Collect logs for dead kubelets too

Collect logs via journalctl if journalctl is installed, rather than only if
kubelet.service is running. The old way resulted in us losing logs any
time the kubelet was failing. This, of course, breaks on a node if
someone decided to install journalctl but not use it. But that is not
the case on any of the images used by cluster-level tests at present.

stefanschneider/kubernetes,stefanschneider/kubernetes,stefanschneider/kubernetes,stefanschneider/kubernetes,stefanschneider/kubernetes