1. Automate the build of a base testing image

This uses packer and a debian template.
Uses tansiv/tansiv as login/mdp by default

2. boot_and_log launcher script has been modified

Start the VMs using two network interfaces.
The first interface uses tantap while the second can serve as a
management interface.

```
ping t10[t11] # will go over the tantap network
pint m10[m11] # will go over a regular tap (bridged network)
```

3. the platform xml file force the latency-factor to 1.

For #6