Authorize super admin actions on all projects

This allows admin super user (user with admin role in admin_project)
to do stack operations across all projects.

Change-Id: Ifbf56fde02b89248ee788e6a212ef9d11e665dc0
Partial-Bug: #1466694
diff --git a/functional/test_encryption_vol_type.py b/functional/test_encryption_vol_type.py
index 2679990..ed49249 100644
--- a/functional/test_encryption_vol_type.py
+++ b/functional/test_encryption_vol_type.py
@@ -50,6 +50,7 @@
         # Temporarily switch to admin
         self.conf.username = self.conf.admin_username
         self.conf.password = self.conf.admin_password
+        self.conf.tenant_name = 'admin'
         self.manager = clients.ClientManager(self.conf)
         self.client = self.manager.orchestration_client
         self.volume_client = self.manager.volume_client