Fix exception name in test_server_actions

"exceptions" used instead of Exception.

Change-Id: Ifdbd7608fba671ee603d35091dd33416c579c2bd
diff --git a/tempest/tests/compute/servers/test_server_actions.py b/tempest/tests/compute/servers/test_server_actions.py
index 5046ec2..d5b2650 100644
--- a/tempest/tests/compute/servers/test_server_actions.py
+++ b/tempest/tests/compute/servers/test_server_actions.py
@@ -41,7 +41,7 @@
         # Check if the server is in a clean state after test
         try:
             self.client.wait_for_server_status(self.server_id, 'ACTIVE')
-        except exceptions:
+        except Exception:
             # Rebuild server if something happened to it during a test
             self.rebuild_servers()