test_find_resource fails if run alone

Currently, we set 'NAME_ATTR' attribute for Volume and Snapshot
class in volume.client.py. When we test test_find_resource alone,
the Volume and Snapshot class do not have 'NAME_ATTR' attribute since
we do not import volume.client, which causes the tests to fail.

Change-Id: I06f727ffa8d37afe1a1191c36574887fecc7a733
Closes-Bug: #1353788

Author: wanghonghw

openstackclient/tests/volume/test_find_resource.py

@@ -21,6 +21,7 @@
 from openstackclient.common import exceptions
 from openstackclient.common import utils
 from openstackclient.tests import utils as test_utils
+from openstackclient.volume import client  # noqa
 
 
 ID = '1after909'