test: make the test jobs dependent on the number of processors
8 simultaneous jobs on a tiny VM running on a 6y old i3 - not ideal. Let's drop the number of default jobs to something sensible (or rather - dependent on the host we're running on).
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8 simultaneous jobs on a tiny VM running on a 6y old i3 - not ideal. Let's drop the number of default jobs to something sensible (or rather - dependent on the host we're running on).