Integrate BerryLan for easy WiFi activation

[ivelin]

It is common for users to connect their Raspberry on a local WiFi. Currently its a relatively involved process.
The BerryLan project makes that much simpler for newbies.

Especially useful for projects that distribute RPI based images to end users who aren't very tech savvy. Ambianic is an example for such projects.

Would be helpful if hypriot solves two major problems simultaneously:

1. Simplify distribution for developers shipping rpi docker packages. Done! Great work!
2. Simplify install and setup for end users, by enabling quick wifi connectivity for new installs.