A few references to state_descripton got missed in the power_state merge

[Vish Ishaya]

vishvananda@argent:~/bzr/os-user_id-description$ ack state_description
bin/nova-manage
169: print vpn['state_description'],
872: instance['state_description'],
1226: stat=vc['state_description'],

nova/api/ec2/admin.py
276: and not instance['state_description'] in

nova/api/openstack/contrib/simple_tenant_usage.py
119: info['state'] = instance['state_description']

nova/tests/test_libvirt.py
678: 'state_description': 'running'}
716: self.assertTrue(instance_ref['state_description'] == 'running')