Python 3: fix usage of reload()

Replace reload() builtin function with six.moves.reload_module() to
make the code compatible with Python 2 and Python 3.

Change-Id: I7572d613fef700b392d412501facc3bd5ee72a66

test/unit/common/test_daemon.py

@@ -17,6 +17,7 @@
 
 import os
 from six import StringIO
+from six.moves import reload_module
 import unittest
 from getpass import getuser
 import logging
@@ -69,7 +70,7 @@ class TestRunDaemon(unittest.TestCase):
         utils.capture_stdio = lambda *args: None
 
     def tearDown(self):
-        reload(utils)
+        reload_module(utils)
 
     def test_run(self):
         d = MyDaemon({})

test/unit/common/test_db_replicator.py

@@ -21,12 +21,14 @@ import logging
 import errno
 import math
 import time
-from mock import patch, call
 from shutil import rmtree, copy
 from tempfile import mkdtemp, NamedTemporaryFile
-import mock
 import json
 
+import mock
+from mock import patch, call
+from six.moves import reload_module
+
 from swift.container.backend import DATADIR
 from swift.common import db_replicator
 from swift.common.utils import (normalize_timestamp, hash_path,
@@ -44,7 +46,7 @@ TEST_CONTAINER_NAME = 'c o n'
 
 def teardown_module():
     "clean up my monkey patching"
-    reload(db_replicator)
+    reload_module(db_replicator)
 
 
 @contextmanager

test/unit/common/test_manager.py

@@ -24,6 +24,8 @@ import errno
 from collections import defaultdict
 from time import sleep, time
 
+from six.moves import reload_module
+
 from swift.common import manager
 from swift.common.exceptions import InvalidPidFileException
 
@@ -283,7 +285,7 @@ class TestManagerModule(unittest.TestCase):
 class TestServer(unittest.TestCase):
 
     def tearDown(self):
-        reload(manager)
+        reload_module(manager)
 
     def join_swift_dir(self, path):
         return os.path.join(manager.SWIFT_DIR, path)