Persist test application logs prior to cluster tear down

[kuujo]

Currently, test namespaces are torn down immediately following test completion. When this happens, logs are lost and cannot be recovered. Onit should persist application logs inside the kube-test namespace as part of the recorded history of test runs. Additionally, onit should support commands for viewing/formatting/downloading logs for past test runs persisted in the kube-test namespace.

[adibrastegarnia]

@kuujo @ray-milkey

Based on the discussion that I had with Ray, I am going to start implementing storing logs in config maps and then we move forward from there for implementing commands, etc.