Correct freezer 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: Ic071e958694166a7df87915f50fe0f4a70f01fab

freezer/storage/swift.py

@@ -36,8 +36,8 @@ class SwiftStorage(physical.PhysicalStorage):
                                                prefix=split[1])[1]:
             try:
                 self.swift().delete_object(split[0], file['name'])
-            except Exception as e:
-                raise e
+            except Exception:
+                raise
 
     def put_file(self, from_path, to_path):
         self.client_manager.create_swift()

freezer/utils/streaming.py

@@ -113,4 +113,4 @@ class QueuedThread(threading.Thread):
             self.rich_queue.force_stop()
             # Thread will exit at this point.
             # @todo print the error using traceback.print_exc(file=sys.stdout)
-            raise e
+            raise