Fix import error "No module named six.moves" for plugin sanity job
Fix import error "No module named six.moves" for plugin sanity job

This commit fixes the import error "No module named six.moves" without
using the module for the plugin sanity job. Because the job call the
script directly.

Change-Id: Id0fa1b15fe443d65a1b6ca008e490d0fa54d6b32

openstack/tempest,masayukig/tempest,openstack/tempest,masayukig/tempest,vedujoshi/tempest,vedujoshi/tempest,cisco-openstack/tempest,cisco-openstack/tempest,Juniper/tempest,Juniper/tempest