Make a new urllib package .

It consists of code from urllib, urllib2, urlparse, and robotparser.
The old modules have all been removed.  The new package has five
submodules: urllib.parse, urllib.request, urllib.response,
urllib.error, and urllib.robotparser.  The urllib.request.urlopen()
function uses the url opener from urllib2.

Note that the unittests have not been renamed for the
beta, but they will be renamed in the future.

Joint work with Senthil Kumaran.

Lib/email/utils.py

@@ -25,6 +25,7 @@ import time
 import base64
 import random
 import socket
+import urllib.parse
 import warnings
 from io import StringIO
 
@@ -218,8 +219,7 @@ def encode_rfc2231(s, charset=None, language=None):
     charset is given but not language, the string is encoded using the empty
     string for language.
     """
-    import urllib
-    s = urllib.quote(s, safe='')
+    s = urllib.parse.quote(s, safe='')
     if charset is None and language is None:
         return s
     if language is None:
@@ -234,7 +234,6 @@ def decode_params(params):
 
     params is a sequence of 2-tuples containing (param name, string value).
     """
-    import urllib
     # Copy params so we don't mess with the original
     params = params[:]
     new_params = []
@@ -272,7 +271,7 @@ def decode_params(params):
             # language specifiers at the beginning of the string.
             for num, s, encoded in continuations:
                 if encoded:
-                    s = urllib.unquote(s)
+                    s = urllib.parse.unquote(s)
                     extended = True
                 value.append(s)
             value = quote(EMPTYSTRING.join(value))