Delete a volume by Non-admin privileges

There is no need to use admin privileges for delete the volume,
since the volume was created by non-admin user.

Change-Id: Icefedbfd56125b5fa46b807b2f4782061cf3b0b4
diff --git a/tempest/api/volume/admin/test_volume_quotas.py b/tempest/api/volume/admin/test_volume_quotas.py
index c4d3a40..d56f1de 100644
--- a/tempest/api/volume/admin/test_volume_quotas.py
+++ b/tempest/api/volume/admin/test_volume_quotas.py
@@ -101,7 +101,7 @@
 
         volume = self.create_volume()
         self.addCleanup(self.delete_volume,
-                        self.admin_volume_client, volume['id'])
+                        self.volumes_client, volume['id'])
 
         new_quota_usage = self.admin_quotas_client.show_quota_set(
             self.demo_tenant_id, params={'usage': True})['quota_set']