Correct tempest reraising of exception

When an exception was caught and rethrown, it should call 'raise'
without any arguments because it shows the place where an
exception occured initially instead of place where
the exception re-raised

Change-Id: Ie84f409a6c91d4ccb71968472266d57dd468a42a
diff --git a/tempest/api/orchestration/stacks/test_neutron_resources.py b/tempest/api/orchestration/stacks/test_neutron_resources.py
index bffcb64..6d27502 100644
--- a/tempest/api/orchestration/stacks/test_neutron_resources.py
+++ b/tempest/api/orchestration/stacks/test_neutron_resources.py
@@ -77,7 +77,7 @@
             cls.client.wait_for_stack_status(cls.stack_id, 'CREATE_COMPLETE')
             resources = (cls.client.list_resources(cls.stack_identifier)
                          ['resources'])
-        except exceptions.TimeoutException as e:
+        except exceptions.TimeoutException:
             if CONF.compute_feature_enabled.console_output:
                 # attempt to log the server console to help with debugging
                 # the cause of the server not signalling the waitcondition
@@ -89,7 +89,7 @@
                 output = cls.servers_client.get_console_output(
                     server_id)['output']
                 LOG.debug(output)
-            raise e
+            raise
 
         cls.test_resources = {}
         for resource in resources: