Scenario test for port forwarding

This patch adds new scenario test for port forwarding functionality.
It creates 1 floating IP, and 1 router, then spawns 2 VMs and configure
2 port forwardings using created floating IP and VMs.
Those 2 port forwardings allows to SSH with 2 different ports to 2
different VMs using same floating IP.

Change-Id: Ie5475c797113cfc5c9bfaf4bbd58c211ed30bc89
2 files changed