Added support for running the tests under PyPy with tox
Added support for running the tests under PyPy with tox

This is a precursor to having them run under check and gate.

Change-Id: I9c2f8218f457aeaa03e06b4a87554fcdc40e4a0a

mmasaki/python-glanceclient,mmasaki/python-glanceclient,JioCloud/python-glanceclient,openstack/python-glanceclient,alexpilotti/python-glanceclient,klmitch/python-glanceclient,openstack/python-glanceclient,metacloud/python-glanceclient,alexpilotti/python-glanceclient,metacloud/python-glanceclient,varunarya10/python-glanceclient,varunarya10/python-glanceclient,JioCloud/python-glanceclient,klmitch/python-glanceclient