util: make cookielib module available

In preparation for supporting sending cookies on HTTP requests.

mercurial/pycompat.py

@@ -18,12 +18,14 b' import sys'
 ispy3 = (sys.version_info[0] >= 3)
 
 if not ispy3:
+    import cookielib
     import cPickle as pickle
     import httplib
     import Queue as _queue
     import SocketServer as socketserver
     import xmlrpclib
 else:
+    import http.cookielib as cookielib
     import http.client as httplib
     import pickle
     import queue as _queue

mercurial/util.py

@@ -49,6 +49,7 b' from . import ('
     pycompat,
 )
 
+cookielib = pycompat.cookielib
 empty = pycompat.empty
 httplib = pycompat.httplib
 httpserver = pycompat.httpserver