iterator that works on python 2 and 3 (#1111)

src/cowrie/shell/shlex.py

@@ -307,12 +307,15 @@ class shlex:
     def __iter__(self):
         return self
 
-    def next(self):
+    def __next__(self):
         token = self.get_token()
         if token == self.eof:
             raise StopIteration
         return token
 
+    # For Python 2.x
+    next = __next__
+
 
 def split(s, comments=False, posix=True):
     lex = shlex(s, posix=posix)