Add Ubuntu 16.04

.travis.yml

@@ -8,6 +8,18 @@ python:
   - "2.7"
   - "3.6"
 env:
+  - >
+    DISTRIBUTION=ubuntu
+    DIST_VERSION=16.04
+    MONGODB_VERSION=3.6
+  - >
+    DISTRIBUTION=ubuntu
+    DIST_VERSION=16.04
+    MONGODB_VERSION=3.4
+  - >
+    DISTRIBUTION=ubuntu
+    DIST_VERSION=16.04
+    MONGODB_VERSION=3.2
   - >
     DISTRIBUTION=ubuntu-upstart
     DIST_VERSION=14.04

tests/site.yml

@@ -17,10 +17,17 @@
         - mongo2
         - mongo3
 
+- hosts: "{{ target }}"
+  gather_facts: false
+  tasks:
+    - name: Install Python 2.x
+      raw: test -e /usr/bin/python || (apt update && apt install -y python-minimal) || true
+      register: test
+      changed_when: test.stdout
+
 - hosts: "{{ target }}"
   become: no
   gather_facts: yes
-
   roles:
     - role: greendayonfire.mongodb
       when: "'mongo_master' in group_names"