Add Ubuntu 16.04 support to tests

Add a Ubuntu Xenial VM to the Vagrantfile configuration. Since Ubuntu 16.04 doesn't include python by default, we have to modify `site.yml` to use install it before running any Ansible modules.

.gitignore

@@ -1,2 +1,4 @@
 .vagrant
 
+*.log
+*.retry

examples/Vagrantfile

@@ -4,10 +4,23 @@
 VAGRANTFILE_API_VERSION = "2"
 
 Vagrant.configure(VAGRANTFILE_API_VERSION) do |config|
-  config.vm.box = "ubuntu/trusty64"
+  config.vm.define "trusty" do |trusty|
+    trusty.vm.box = "ubuntu/trusty64"
+    trusty.vm.hostname = "trusty64"
 
-  config.vm.provision "ansible" do |ansible|
-    ansible.playbook = "site.yml"
-    ansible.sudo = true
+    trusty.vm.provision "ansible" do |ansible|
+      ansible.playbook = "site.yml"
+      ansible.sudo = true
+    end
+  end
+
+  config.vm.define "xenial" do |xenial|
+    xenial.vm.box = "ubuntu/xenial64"
+    xenial.vm.hostname = "xenial64"
+
+    xenial.vm.provision "ansible" do |ansible|
+      ansible.playbook = "site.yml"
+      ansible.sudo = true
+    end
   end
 end

examples/site.yml

@@ -1,4 +1,32 @@
 ---
 - hosts: all
+  gather_facts: False
+
+  pre_tasks:
+
+    # Check Ubuntu release version to determine if we need to install Python 2,
+    # an ansible dependency that isn't included by default in Ubuntu 16.04 and
+    # up.
+
+    - name: Check Ubuntu release
+      raw: cat /etc/lsb-release | grep DISTRIB_RELEASE | cut -d "=" -f2
+      register: ubuntu_release
+
+    - debug: msg="Running ubuntu version {{ ubuntu_release.stdout }}"
+
+    # Update apt cache and install python 2 for Ubuntu versions greater than 16.04
+    - name: Update APT cache
+      raw: apt-get update
+      become: True
+
+    - name: Install Python
+      raw: apt-get install -yq python
+      become: True
+      when: ubuntu_release.stdout | version_compare('16.04', '>=')
+
+    # Gather facts once ansible dependencies are installed
+    - name: Gather facts
+      setup:
+
   roles:
     - { role: "app.papertrail" }