Full response for VolumeTypesClient methods

Provide the entire response object for all methods of the
VolumeTypesClient

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

Change-Id: Ie7bc81c0a9c668020797454428757095d7f396d3
diff --git a/tempest/scenario/manager.py b/tempest/scenario/manager.py
index 89b0842..3cfff4d 100644
--- a/tempest/scenario/manager.py
+++ b/tempest/scenario/manager.py
@@ -1281,7 +1281,7 @@
         randomized_name = data_utils.rand_name('scenario-type-' + name)
         LOG.debug("Creating a volume type: %s", randomized_name)
         body = client.create_volume_type(
-            randomized_name)
+            randomized_name)['volume_type']
         self.assertIn('id', body)
         self.addCleanup(client.delete_volume_type, body['id'])
         return body
@@ -1297,7 +1297,7 @@
         LOG.debug("Creating an encryption type for volume type: %s", type_id)
         client.create_encryption_type(
             type_id, provider=provider, key_size=key_size, cipher=cipher,
-            control_location=control_location)
+            control_location=control_location)['encryption']
 
 
 class SwiftScenarioTest(ScenarioTest):