Fix for issue1153027, making Py3k changes similar to fix in issue918368.

This will address:
a) urllib/ in py3k,
b) urllib in py2x is addressed by issue918368.
c) urllib2 in py2x was already addressed in Revision 43132.

Lib/urllib/request.py

@@ -1398,6 +1398,7 @@ class URLopener:
     def open(self, fullurl, data=None):
         """Use URLopener().open(file) instead of open(file, 'r')."""
         fullurl = unwrap(to_bytes(fullurl))
+        fullurl = quote(fullurl, safe="%/:=&?~#+!$,;'@()*[]")
         if self.tempcache and fullurl in self.tempcache:
             filename, headers = self.tempcache[fullurl]
             fp = open(filename, 'rb')