Work around pypy testing issue
Work around pypy testing issue

A recent release of setuptools appears to have introduced a bug that
causes the pypy gate tests to fail. This applies a temporary workaround
that should restore pypy testing while the root cause of the problem is
researched.

The work around is suggested in the comment in bug 1290562.

Change-Id: Iac2ec604447b1638550219cd2e407daf188f8ede
Partial-Bug: 1290562

mangelajo/python-neutronclient,Stavitsky/python-neutronclient,JioCloud/python-neutronclient,cernops/python-neutronclient,Juniper/python-neutronclient,NeCTAR-RC/python-neutronclient,mangelajo/python-neutronclient,huntxu/python-neutronclient,roaet/python-neutronclient,rackerlabs/rackspace-python-neutronclient,varunarya10/python-neutronclient,Stavitsky/python-neutronclient,Juniper/python-neutronclient,rackerlabs/rackspace-python-neutronclient,johnpbatty/python-neutronclient,varunarya10/python-neutronclient,NeCTAR-RC/python-neutronclient,cryptickp/python-neutronclient,venusource/python-neutronclient,noironetworks/python-neutronclient,sajuptpm/python-neutronclient-ipam,cryptickp/python-neutronclient,johnpbatty/python-neutronclient,openstack/python-neutronclient,noironetworks/python-neutronclient,venusource/python-neutronclient,JioCloud/python-neutronclient,eayunstack/python-neutronclient,yamahata/python-tackerclient,roaet/python-neutronclient,cernops/python-neutronclient,huntxu/python-neutronclient,sajuptpm/python-neutronclient-ipam,eayunstack/python-neutronclient,openstack/python-neutronclient,yamahata/python-tackerclient