Remove Sahara tests from Tempest

I think now is a good time. It's been sitting here for ages. We
really should try to make Tempest smaller.

Change-Id: I3370a146042f23a5ba2ca40d2ddf76e7c9e9cf0f
diff --git a/tempest/clients.py b/tempest/clients.py
index 765a526..6cb6980 100644
--- a/tempest/clients.py
+++ b/tempest/clients.py
@@ -24,7 +24,6 @@
 from tempest.lib import exceptions as lib_exc
 from tempest.lib.services import clients
 from tempest.services import baremetal
-from tempest.services import data_processing
 from tempest.services import identity
 from tempest.services import object_storage
 from tempest.services import orchestration
@@ -39,7 +38,7 @@
 
     default_params = config.service_client_config()
 
-    # TODO(andreaf) This is only used by data_processing and baremetal clients,
+    # TODO(andreaf) This is only used by baremetal clients,
     # and should be removed once they are out of Tempest
     default_params_with_timeout_values = {
         'build_interval': CONF.compute.build_interval,
@@ -84,12 +83,6 @@
             build_interval=CONF.orchestration.build_interval,
             build_timeout=CONF.orchestration.build_timeout,
             **self.default_params)
-        self.data_processing_client = data_processing.DataProcessingClient(
-            self.auth_provider,
-            CONF.data_processing.catalog_type,
-            CONF.identity.region,
-            endpoint_type=CONF.data_processing.endpoint_type,
-            **self.default_params_with_timeout_values)
         self.negative_client = negative_rest_client.NegativeRestClient(
             self.auth_provider, service, **self.default_params)