Protected matcher import
In python the names starts with '_'should not be used from another
package/distribution without a good reason.
The matchers are reachable from a not protected namespace.
Change-Id: I8892599edcbe7c4dd1cebea2c99e81a3221f8ef5
diff --git a/tempest/api/identity/admin/test_users.py b/tempest/api/identity/admin/test_users.py
index 6f90b04..cbbe05d 100644
--- a/tempest/api/identity/admin/test_users.py
+++ b/tempest/api/identity/admin/test_users.py
@@ -15,7 +15,7 @@
# License for the specific language governing permissions and limitations
# under the License.
-from testtools.matchers._basic import Contains
+from testtools.matchers import Contains
from tempest.api.identity import base
from tempest.common.utils.data_utils import rand_name