[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/trial/serverspec/default_spec.rb

@@ -0,0 +1,7 @@
+require 'shared_spec'
+require 'json'
+vars = JSON.parse(File.read('/tmp/vars.json'))
+
+describe 'trial tests' do
+  include_examples 'shared::init', vars
+end

test/integration/trial/trial.yml

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