D8657: procutil: make recent fix for zombies compatible with py2
martinvonz created this revision.
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The fix in ed684a82e29b <https://phab.mercurial-scm.org/rHGed684a82e29bbea8556c3079f6159a9159689078> (procutil: always waiting on child processes
to prevent zombies with 'hg serve', 2020-05-07) works only on Python 3
because it passes a `daemon` argument to `threading.Thread()`. Python
2 requires you to assign to the `.daemon` property instead. Python 3
also seems to support that, so this patch fixes the code by
unconditionally using the old form.