Test in Travis with kitchen-dokken

Signed-off-by: Tim Smith <tsmith@chef.io>

.kitchen.dokken.yml

+driver:
+  name: dokken
+  privileged: true # because Docker and SystemD/Upstart
+
+transport:
+  name: dokken
+
+provisioner:
+  name: dokken
+
+platforms:
+- name: debian-8
+  driver:
+    image: dokken/debian-8
+    pid_one_command: /bin/systemd
+    intermediate_instructions:
+      - RUN /usr/bin/apt-get update
+
+- name: debian-9
+  driver:
+    image: dokken/debian-9
+    pid_one_command: /bin/systemd
+    intermediate_instructions:
+      - RUN /usr/bin/apt-get update
+
+- name: centos-6
+  driver:
+    image: dokken/centos-6
+    platform: rhel
+    pid_one_command: /sbin/init
+
+- name: centos-7
+  driver:
+    image: dokken/centos-7
+    platform: rhel
+    pid_one_command: /usr/lib/systemd/systemd
+
+- name: fedora-26
+  driver:
+    image: dokken/fedora-26
+    pid_one_command: /usr/lib/systemd/systemd
+
+- name: fedora-27
+  driver:
+    image: dokken/fedora-27
+    pid_one_command: /usr/lib/systemd/systemd
+
+- name: ubuntu-14.04
+  driver:
+    image: dokken/ubuntu-14.04
+    pid_one_command: /sbin/init
+    intermediate_instructions:
+      - RUN /usr/bin/apt-get update
+
+- name: ubuntu-16.04
+  driver:
+    image: dokken/ubuntu-16.04
+    pid_one_command: /bin/systemd
+    intermediate_instructions:
+      - RUN /usr/bin/apt-get update
+
+- name: opensuse-leap
+  driver:
+    image: dokken/opensuse-leap
+    pid_one_command: /bin/systemd

.travis.yml

-
+sudo: required
 dist: trusty
-sudo: false
+
 addons:
   apt:
     sources:
@@ -8,20 +8,33 @@ addons:
     packages:
       - chefdk
 
-# Don't `bundle install`
+# Don't `bundle install` which takes about 1.5 mins
 install: echo "skip bundle install"
 
 branches:
   only:
     - master
 
-# Ensure we make ChefDK's Ruby the default
-before_script:
-  - eval "$(chef shell-init bash)"
+services: docker
 
-script:
+env:
+  matrix:
+  - INSTANCE=default-ubuntu-1404
+  - INSTANCE=default-ubuntu-1604
+  - INSTANCE=default-centos-7
+  - INSTANCE=default-debian-8
+
+before_script:
+  - sudo iptables -L DOCKER || ( echo "DOCKER iptables chain missing" ; sudo iptables -N DOCKER )
+  - eval "$(/opt/chefdk/bin/chef shell-init bash)"
   - chef --version
   - cookstyle --version
   - foodcritic --version
-  - chef exec delivery local all
 
+script: KITCHEN_LOCAL_YAML=.kitchen.dokken.yml kitchen verify ${INSTANCE}
+
+matrix:
+  include:
+    - script:
+      - /opt/chefdk/bin/chef exec delivery local all
+      env: UNIT_AND_LINT=1