Simplify packer config

.travis.yml

@@ -1,13 +1,21 @@
-sudo: false
+sudo: required
+services:
+  - docker
 language: python
-python:
-  - "2.7"
-env:
-    - TOX_ENV=flake8
-    - TOX_ENV=py27
-    - TOX_ENV=py26
+matrix:
+  include:
+    - python: 2.6
+      env: TOXENV=py26
+    - python: 2.7
+      env: TOXENV=py27
+    - python: 3.5
+      env: TOXENV=py35
+    - python: 3.6
+      env: TOXENV=py36
+    - python: 3.6
+      env: TOXENV=flake8
+
 install:
     - pip install tox
 script:
-    - tox -e $TOX_ENV
-
+    - tox -e $TOXENV

tests/resources/simple-test.json

@@ -1,10 +1,10 @@
 {
   "builders": [
     {
-      "type": "null",
-      "ssh_host": "127.0.0.1",
-      "ssh_username": "root",
-      "ssh_password": "password"
+      "type": "docker",
+      "image": "alpine",
+      "discard": true,
+      "run_command": ["-d", "-i", "-t", "{{.Image}}", "/bin/sh"]
     }
   ]
 }

tox.ini

@@ -1,6 +1,6 @@
 # content of: tox.ini , put in same dir as setup.py
 [tox]
-envlist=flake8,py27,py26,py35
+envlist=flake8,py27,py26,py35,py36
 
 [testenv]
 deps =