ingress-sbox not always created

ingress-sbox not always created  @mavenugo 

Environment:

```
Red Hat Enterprise Linux Server release 7.2 (Maipo)
[root@node2 ~]# uname -a
Linux node2 3.10.0-327.22.2.el7.x86_64 #1 SMP Thu Jun 9 10:09:10 EDT 2016 x86_64 x86_64 x86_64 GNU/Linux
```
