Test BIND exporter

There is existing BIND exporter: https://github.com/digitalocean/bind_exporter

The goal of this task is to try to set it up and evaluate its usefulness.

Take the following aspects into consideration:

• how tricky it is to expand it to report multiple data points (20 or however many kea reports) for each statistic
• what's the license (can we use it)
• how easy it is extend it in general (is it good source base?)

Keep in mind that the goal for now is to make it functional, but in the future we want it to be performant. If the data handling process is not efficient, make notes and possibly propose improvement (but don't write any code yet).