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:
/bib/sh.

Change-Id: Iee0a1fcbdabfd469e92fa73002763d419e75ec27

WiFast/pbr,JioCloud/pbr,WiFast/pbr,openstack-dev/pbr,JioCloud/pbr,citrix-openstack-build/pbr,varunarya10/pbr,citrix-openstack-build/pbr,emonty/oslo-packaging,redhat-openstack/pbr,openstack-dev/pbr,emonty/oslo-packaging,klmitch/pbr,citrix-openstack-build/pbr,redhat-openstack/pbr,varunarya10/pbr,klmitch/pbr,openstack-dev/pbr