Problem with pod termination

[jellonek]

After pod delete we have called stop/remove container, stop pod sandbox, and there is a loop on last one. Probably because something with statuses (get pods gives "terminating" state or something similar).
After ~5min. afair we have final pod sandbox remove request which cleans remains properly, but it's called probably after timeout, even if we still have "terminating" state.

This should be covered by tests also.

[jellonek]

Termination state is now covered, will fill separate issue if fixing #135 will not end pod removal problem.