gsutil: Use urllib2 instead of urllib.

gsutil.py

Index: gsutil.py
diff --git a/gsutil.py b/gsutil.py
index e3f50d4687cdc687832b48b33ff21bf7f1341f3a..d4649c8541719e220dab416ec8b0a979886e4cde 100755
--- a/gsutil.py
+++ b/gsutil.py
@@ -14,7 +14,7 @@ import base64
 import os
 import sys
 import json
-import urllib
+import urllib2
 import subprocess
 
 
@@ -67,7 +67,7 @@ def download_gsutil(version, target_dir):
     local_md5 = md5_calc.hexdigest()
 
     metadata_url = '%s%s' % (API_URL, filename)
-    metadata = json.load(urllib.urlopen(metadata_url))
+    metadata = json.load(urllib2.urlopen(metadata_url))
     remote_md5 = base64.b64decode(metadata['md5Hash'])
 
     if local_md5 == remote_md5:
@@ -76,7 +76,7 @@ def download_gsutil(version, target_dir):
 
   # Do the download.
   url = '%s%s' % (GSUTIL_URL, filename)
-  u = urllib.urlopen(url)
+  u = urllib2.urlopen(url)
   with open(target_filename, 'wb') as f:
     while True:
       buf = u.read(4096)