GitLab

* For the web applications

* Move all hosts
* Change hostnames
* Change IPs in configurations
* Improve IPA setup
* Update roles:
  * opera
  * lasarchiv
  * common/printer
  * ipa_hosts

Fix issue #41 and make Opera role run again

Fedora 28 does not provide python2-firewalld which is needed by the
ansible module firewalld. Therefore these roles would fail. See issue #28 for this

This is not a fix, but a dirty hack to let the other tasks complete

* Add the SSH key as a variable
* Encrypt the file containing this variable

* installed is no longer supported
* some fixes in handlers

* enable smartd
* scan discs every night
* mail if discs get corrupt

* Add missing host_vars files
* Fix syntax errors
* Fix Problems with Ubuntu/lab computer

* LaTeX rule still seems not to be that stable, therefore removed from
site.yml
* Rename all versions to lasarchiv1 to be consistent
* Update SSH playbook of common rule to open the ports in the firewall

* Add missing host_vars files
* Fix syntax errors
* Fix Problems with Ubuntu/lab computer

* it does not work

* Use nmcli module instead of writing the resolv.conf which is
overwritten each time the network manager recognizes it.

* Common for all systems