Initial commit for acceptance testing

Uses Kitchen-CI, kitchen-ansible and kitchen-docker components
Also uses serverspec.

Currently supports:

- CentOS 6, 7
- Debian 7, 8
- Ubuntu 14.04

test/integration/default/default.yaml

@@ -0,0 +1,2 @@
+---
+- host: test-kitchen

test/integration/default/serverspec/default_spec.rb

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+require 'spec_helper'
+
+context "basic tests" do
+
+  describe user('elasticsearch') do
+    it { should exist }
+  end
+
+  describe service('elasticsearch') do
+    it { should be_running }
+  end
+
+  describe package('elasticsearch') do
+    it { should be_installed }
+  end
+
+  describe file('/etc/elasticsearch/elasticsearch.yml') do
+    it { should be_file }
+  end
+
+  describe command('curl localhost:9200/_nodes/?plugin | grep kopf') do
+    its(:stdout) { should match /kopf/ }
+    its(:exit_status) { should eq 0 }
+  end
+
+end
+

test/integration/default/serverspec/spec_helper.rb

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+require 'serverspec'
+set :backend, :exec