Use tempest.lib data_utils - volume

Tempest has duplicated modules of data_utils, one is tempest.lib and
the other is tempest.common. The difference is tempest.common module
refers to the config option resources_prefix. And the option is marked
as deprecated already. So it is nice to replace the calls with tempest.lib
one.

Change-Id: I90cd12ac7a8050125956654feb0fa8a221e7958e
diff --git a/tempest/api/volume/test_volumes_actions.py b/tempest/api/volume/test_volumes_actions.py
index 0a6901c..d39b07a 100644
--- a/tempest/api/volume/test_volumes_actions.py
+++ b/tempest/api/volume/test_volumes_actions.py
@@ -14,9 +14,9 @@
 #    under the License.
 
 from tempest.api.volume import base
-from tempest.common.utils import data_utils
 from tempest.common import waiters
 from tempest import config
+from tempest.lib.common.utils import data_utils
 from tempest.lib.common.utils import test_utils
 from tempest.lib import decorators
 from tempest.lib import exceptions