[meta] refactor kitchen tests (#765)

* [meta] refactor kitchen tests

This commit update kitchen tests to match important feature to test:
- default: test a deployment with all default values
- license: test a deployment with a license and default values
- trial: test a deployment with security enabled and trial license
- oss: test a deployment with oss version and default values (6.x only)
- upgrade: test an upgrade from a previous version
- oss-upgrade: test an upgrade with oss version (6.x only)
- oss-to-default-upgrade: test an upgrade from previous oss to latest
default version
- custom_config: test a deployment with custom config files
- security: test a deployment with security enabled

* [meta] fix license test

test/integration/helpers/serverspec/license_spec.rb

@@ -0,0 +1,27 @@
+require 'spec_helper'
+require 'json'
+require 'pathname'
+vars = JSON.parse(File.read('/tmp/vars.json'))
+
+es_api_url = "#{vars['es_api_scheme']}://localhost:#{vars['es_api_port']}"
+username = vars['es_api_basic_auth_username']
+password = vars['es_api_basic_auth_password']
+es_keystore = Pathname.new(vars['es_ssl_keystore']).basename.to_s
+es_truststore = Pathname.new(vars['es_ssl_truststore']).basename.to_s
+
+if vars['es_major_version'] == '7.x'
+  es_license_api = "_license"
+else
+  es_license_api = "_xpack/license"
+end
+
+shared_examples 'license::init' do |vars|
+  describe 'License check' do
+    result = curl_json("#{es_api_url}/#{es_license_api}", username=username, password=password)
+    it 'should list the license issued by Elastic' do
+      expect(result['license']['status']).to eq('active')
+      expect(result['license']['type']).to eq('trial')
+      expect(result['license']['issued_to']).to eq('Elastic - INTERNAL (non-production environments)')
+    end
+  end
+end