distro/tests: remove rolling release distros

distro/tests/arch/Vagrantfile

-# -*- mode: ruby -*-
-# vi: set ft=ruby :
-#
-
-Vagrant.configure(2) do |config|
-
-    config.vm.box = "archlinux/archlinux"
-    config.vm.synced_folder ".", "/vagrant", disabled: true
-
-    config.vm.define "arch_knot-dns"  do |machine|
-        machine.vm.provision "ansible" do |ansible|
-            ansible.playbook = "../knot-dns-test.yaml"
-        end
-    end
-
-end

distro/tests/tumbleweed/Vagrantfile

-# -*- mode: ruby -*-
-# vi: set ft=ruby :
-#
-
-Vagrant.configure(2) do |config|
-
-    config.vm.box = "opensuse/openSUSE-Tumbleweed-x86_64"
-    config.vm.synced_folder ".", "/vagrant", disabled: true
-
-    config.vm.define "tumbleweed_knot-dns"  do |machine|
-        machine.vm.provision "ansible" do |ansible|
-            ansible.playbook = "../knot-dns-test.yaml"
-        end
-    end
-
-end