Py3: Fixes eventlet ImportError: No module named urllib2

Python3:
from eventlet.green.urllib import request
Python2:
from eventlet.green import urllib2

Change-Id: Ib38865e0b6a8f076b8a54de4fae221d49f315c91

doc/source/development_middleware.rst

@@ -81,7 +81,11 @@ presented below::
     from swift.proxy.controllers.base import get_container_info
 
     from eventlet import Timeout
-    from eventlet.green import urllib2
+    import six
+    if six.PY3:
+        from eventlet.green.urllib import request as urllib2
+    else:
+        from eventlet.green import urllib2
 
     # x-container-sysmeta-webhook
     SYSMETA_WEBHOOK = get_sys_meta_prefix('container') + 'webhook'

swift/cli/recon.py

@@ -17,7 +17,7 @@
 
 from __future__ import print_function
 
-from eventlet.green import urllib2, socket
+from eventlet.green import socket
 from six.moves.urllib.parse import urlparse
 from swift.common.utils import SWIFT_CONF_FILE
 from swift.common.ring import Ring
@@ -28,8 +28,14 @@ import json
 import optparse
 import time
 import sys
+import six
 import os
 
+if six.PY3:
+    from eventlet.green.urllib import request as urllib2
+else:
+    from eventlet.green import urllib2
+
 
 def seconds2timeunit(seconds):
     elapsed = seconds

swift/common/internal_client.py

@@ -14,7 +14,7 @@
 # limitations under the License.
 
 from eventlet import sleep, Timeout
-from eventlet.green import httplib, socket, urllib2
+from eventlet.green import httplib, socket
 import json
 import six
 from six.moves import range
@@ -32,6 +32,11 @@ from swift.common.swob import Request
 from swift.common.utils import quote
 from swift.common.wsgi import loadapp, pipeline_property
 
+if six.PY3:
+    from eventlet.green.urllib import request as urllib2
+else:
+    from eventlet.green import urllib2
+
 
 class UnexpectedResponse(Exception):
     """

test/unit/cli/test_recon.py

@@ -22,8 +22,9 @@ import time
 import unittest
 import shutil
 import sys
+import six
 
-from eventlet.green import urllib2, socket
+from eventlet.green import socket
 from six import StringIO
 from six.moves import urllib
 
@@ -34,6 +35,11 @@ from swift.common.ring import utils as ring_utils
 from swift.common.storage_policy import StoragePolicy, POLICIES
 from test.unit import patch_policies
 
+if six.PY3:
+    from eventlet.green.urllib import request as urllib2
+else:
+    from eventlet.green import urllib2
+
 
 class TestHelpers(unittest.TestCase):
     def test_seconds2timeunit(self):

test/unit/common/test_internal_client.py

@@ -25,7 +25,6 @@ from six import StringIO
 from six.moves import range
 from six.moves.urllib.parse import quote
 from test.unit import FakeLogger
-from eventlet.green import urllib2
 from swift.common import exceptions, internal_client, swob
 from swift.common.header_key_dict import HeaderKeyDict
 from swift.common.storage_policy import StoragePolicy
@@ -33,6 +32,11 @@ from swift.common.storage_policy import StoragePolicy
 from test.unit import with_tempdir, write_fake_ring, patch_policies
 from test.unit.common.middleware.helpers import FakeSwift
 
+if six.PY3:
+    from eventlet.green.urllib import request as urllib2
+else:
+    from eventlet.green import urllib2
+
 
 class FakeConn(object):
     def __init__(self, body=None):