Update of the NETWAYS training material for Foreman 3.5 / Katello 4.7

As the last update was a while ago and I was already asked if we still do updates on it, I can happily announce I released a new version based on Foreman 3.5 and Katello 4.7.

Took me a while because I wanted to restructure it matching our experience with much more installation being Katello nowadays. I also found and reported a lot of small bugs in the process. But now you can find the version 1.7 of the course material on github.com/NETWAYS.

With the slides being available at netways.github.io/foreman-training and the handouts, exercise guide and solutions attached to the release.