chor: switch vagrant box to xenial

Vagrantfile

@@ -5,14 +5,17 @@ Vagrant.configure("2") do |config|
   config.vbguest.no_remote = true
   config.vbguest.auto_update = false
 
-  config.vm.define 'trusty' do |instance|
-    instance.vm.box = 'ubuntu/trusty64'
+  config.vm.define 'xenial' do |instance|
+    instance.vm.box = 'ubuntu/xenial64'
   end
 
+  config.vm.provision "shell", inline: "sudo apt-get update"
+  config.vm.provision "shell", inline: "sudo apt-get install -y python"
+
   # View the documentation for the provider you're using for more
   # information on available options.
   config.vm.provision "ansible" do |ansible|
-    ansible.playbook = "tests/playbook.yml"
+    ansible.playbook = "tests/main.yml"
     ansible.verbose = 'vv'
     ansible.sudo = true
   end