Comment 5 for bug 1693713

Verified on 9.0-2017-09-01 snapshot
With proposed:
root@node-1:~# cinder show 323eb307-44b6-4ad1-beac-ea5e51c4e6f0|grep metadata
| metadata | {u'test': u'\u0442\u0435\u0441\u0442'} |