Respect probe selection in humility debugmailbox
#578
Merged
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To access the debugmailbox, we have to jump through some extra hoops to get the raw debug probe. We should still respect the probe selected via the command line or
HUMILITY_PROBEenvironment variable. If no probe is specified we go with the existing behavior of chosing the first probe, otherwise the probe must be specified invid:pid:serialformat.