Fixes setup compatibility issue on Windows
Fixes setup compatibility issue on Windows

Fixes Bug #1052161

"python setup.py build" fails on Windows due to a hardcoded shell path:
/bin/sh

setup.py updated using openstack-common/update.py

Change-Id: I3943725a1f4b067a06f8f850e993c6867399a967

redhat-openstack/python-neutronclient,redhat-openstack/python-neutronclient