Updated openstack/openstack
Project: openstack/python-novaclient  e3d686f39ad9787a70894dff3db9352be6b3f0dd
null
Replace basestring by six.string_types

Method shell._boot uses class basestring instead of six.string_types.
Tests don't check this method with several hints, so we didn't have
NameError in py33 env.

Change-Id: I9b35cd7ba162140a15929f9fc8a6d21755b3570c