Open Stack

Hi folks,

I know there is a bunch of usage of subprocess in openstack and 
especially since there is heavy usage of python 2.7 it made me wonder if 
we should try to move to subprocess32 to avoid some of the bugs that 
seem to exist (maybe distributors backported them?):

For example a major one (seems to be):

- https://github.com/google/python-subprocess32/commit/6ef1fea55

"""Popen.wait() is now thread safe so that multiple

threads may be calling wait() or poll() on a Popen instance at the same time
without losing the Popen.returncode value.
"""

That one concerns me slightly, because I know that certain openstack 
projects do use threads (and not eventlet monkey-patched green-thread 
hybrids).

TLDR; should we (could we?) switch?

-Josh