Davanum Srinivas 36fb964f0c Allow preexec_fn method for processutils.execute
If the user specifies preexec_fn, we should call that in
our existing _subprocess_setup. On windows, we silently
drop this preexec_fn as subprocess.Popen raises a ValueError
if we do pass it in.

Change-Id: I0176c66fa2de001aa14f0d928d06fd894de55511
2015-07-07 10:12:58 -07:00
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