Fix "import xx as xx" grammer

This is to do the same fix as If7841e177c47b00a52fd4638a21295e14ebc110f,
which removes the redundant "import xx as xx" grammer.

Change-Id: If91b3c8c00ab534c4c9d5e91006f76254dc5a4a8
diff --git a/tempest/api/identity/admin/v3/test_oauth_consumers.py b/tempest/api/identity/admin/v3/test_oauth_consumers.py
index 970ead3..062cce5 100644
--- a/tempest/api/identity/admin/v3/test_oauth_consumers.py
+++ b/tempest/api/identity/admin/v3/test_oauth_consumers.py
@@ -17,7 +17,7 @@
 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 as exceptions
+from tempest.lib import exceptions
 
 
 class OAUTHConsumersV3Test(base.BaseIdentityV3AdminTest):