Merge pull request #404 from luofeilong/master

fix xid out of range

Author: harlowja

kazoo/protocol/connection.py

@@ -439,7 +439,7 @@ def _send_request(self, read_timeout, connect_timeout):
         if request.type == Auth.type:
             xid = AUTH_XID
         else:
-            self._xid += 1
+            self._xid = (self._xid % 2147483647) + 1
             xid = self._xid
 
         self._submit(request, connect_timeout, xid)