Added a script to pull the IPs of all the relays to your docker node

[cswenor]

No description provided.

[hsoerensen]

There is opportunity to make a couple of improvements here:

• netstat may not be installed on all distributions. It's part of net-tools which on Ubuntu is not a default package.
• nsenter do require root to execute

We can improve by

• Installing netstat on-demand
• Ensure that the script runs as sudo if user id != 0

The main install.sh file do contain logic for running as sudo, as we could either duplicate here, or modularize certain components by extracting and then using source to bring them into scope (unless there's better options ofc) across the various files, doing this would req. an assembly step for the install.sh file (due download nature), however it could benefit us by also allowing us to more easily adopt and introduce shunit2.