Move aws nested stack tests to functional tests

- use swift to post templates to.
- move limit tests to test_stack_resource

Part of blueprint decouple-nested
Change-Id: Id11e86835addc21301b3534a559d1754a802425e
diff --git a/common/test.py b/common/test.py
index 4c96567..2c09dcb 100644
--- a/common/test.py
+++ b/common/test.py
@@ -85,6 +85,7 @@
         self.compute_client = self.manager.compute_client
         self.network_client = self.manager.network_client
         self.volume_client = self.manager.volume_client
+        self.object_client = self.manager.object_client
         self.useFixture(fixtures.FakeLogger(format=_LOG_FORMAT))
 
     def status_timeout(self, things, thing_id, expected_status,