Full response for v2 IdentityClient methods

Provide the entire response object for all methods of the v2 IdentityClient.

partially implements: blueprint method-return-value-and-move-service-clients-to-lib

Change-Id: I40447c4f279399347465b5fba92db30103e03ab4
diff --git a/tempest/cmd/javelin.py b/tempest/cmd/javelin.py
index 30fb38c..0be9f01 100755
--- a/tempest/cmd/javelin.py
+++ b/tempest/cmd/javelin.py
@@ -273,7 +273,7 @@
     Don't create the tenants if they already exist.
     """
     admin = keystone_admin()
-    body = admin.identity.list_tenants()
+    body = admin.identity.list_tenants()['tenants']
     existing = [x['name'] for x in body]
     for tenant in tenants:
         if tenant not in existing: