Py2.7 tweaks and fix ACK_FAILURE bug

Author: technige

neo4j/util.py

@@ -136,6 +136,9 @@ def discard(self, element):
         except KeyError:
             pass
 
+    def next(self):
+        return self.__next__()
+
     def remove(self, element):
         try:
             del self._elements[element]

neo4j/v1/session.py

@@ -30,7 +30,10 @@
 from collections import deque
 import re
 from threading import Lock
-from time import monotonic
+try:
+    from time import monotonic as clock
+except ImportError:
+    from time import clock
 from warnings import warn
 
 from neo4j.util import RoundRobinSet
@@ -204,7 +207,7 @@ class ConnectionRouter(object):
     cluster that supports routing.
     """
 
-    timer = monotonic
+    timer = clock
 
     def __init__(self, pool, *routers):
         self.pool = pool