Remove migrated utils code

This commit removes all the utils code which has been migrated to
tempest-lib and updates the uses of it to point to the library instead.

Change-Id: I9207641aa91c0ea7feb8e067316fc220880c3a3b
diff --git a/tempest/scenario/test_aggregates_basic_ops.py b/tempest/scenario/test_aggregates_basic_ops.py
index ff450de..568ad43 100644
--- a/tempest/scenario/test_aggregates_basic_ops.py
+++ b/tempest/scenario/test_aggregates_basic_ops.py
@@ -13,8 +13,9 @@
 #    License for the specific language governing permissions and limitations
 #    under the License.
 
+from tempest_lib.common.utils import data_utils
+
 from tempest.common import tempest_fixtures as fixtures
-from tempest.common.utils import data_utils
 from tempest.openstack.common import log as logging
 from tempest.scenario import manager
 from tempest import test