fix(nettests): failing to start a nettest is a warning #1373
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Emitting an error causes ooni/probe-desktop to try to generate a warning window that (1) is a bit unpleasant to visually see and (2) more importantly is not proper to show, given that we have default-disabled experiments right now.
Also, in my book, we should emit warning if we continue running and errors when we stop. (Maybe it's not the best book considering that assumes that all errors are fatal; in any case, try to be consistent with this convention.)
See ooni/probe#2576 for extra information.