tree f7604853cb160a499b8daab91cbe077158698c55
parent 2c2b76862c488b8237e8348fac5c1f19083ca5cb
author Pingping Lin <pingping@onlab.us> 1430430063 -0700
committer Gerrit Code Review <gerrit@onlab.us> 1430852496 +0000

add a vBNG application

This is a virtual Broadband Network Gateway (BNG) application.
It mainly has 3 functions:
(1) assigns and replies a public IP address to a REST request
    with a private IP address
(2) maintains the mapping from the private IP address to the
    public IP address
(3) installs point to point intents for the host configured
    with private IP address to access Internet

Change-Id: Ie78614a1703422a57f3c325540b927cc4ae603f4