Add Savanna client for node group templates

It adds data_processing service with simple Savanna client that currently
supports only CRUD operations with node group templates.

Change-Id: Ic96ae88fcfe164f4953013a2d4433bc9c9bf6c6d
diff --git a/tempest/clients.py b/tempest/clients.py
index ac79ce0..fb3c27a 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -104,6 +104,7 @@
     TenantUsagesClientXML
 from tempest.services.compute.xml.volumes_extensions_client import \
     VolumesExtensionsClientXML
+from tempest.services.data_processing.v1_1.client import DataProcessingClient
 from tempest.services.identity.json.identity_client import IdentityClientJSON
 from tempest.services.identity.json.identity_client import TokenClientJSON
 from tempest.services.identity.v3.json.credentials_client import \
@@ -323,6 +324,7 @@
         self.custom_object_client = ObjectClientCustomizedHeader(*client_args)
         self.custom_account_client = \
             AccountClientCustomizedHeader(*client_args)
+        self.data_processing_client = DataProcessingClient(*client_args)
 
 
 class AltManager(Manager):