[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/oss-upgrade.yml

@@ -1,5 +1,5 @@
 ---
-- name: Standard test for single node setup. Tests idempotence.
+- name: Deploy Elasticsearch OSS previous version
   hosts: localhost
   post_tasks:
     - include: elasticsearch/test/integration/debug.yml
@@ -8,9 +8,8 @@
   vars:
     es_version: "{{ '7.0.0' if es_major_version == '7.x' else '6.7.1' }}" # This is set to an older version than the current default to force an upgrade
     oss_version: true
-    es_heap_size: "1g"
 
-- name: Standard test for single node setup. Tests idempotence.
+- name: Deploy Elasticsearch OSS latest version
   hosts: localhost
   post_tasks:
     - include: elasticsearch/test/integration/debug.yml
@@ -18,4 +17,3 @@
     - elasticsearch
   vars:
     oss_version: true
-    es_heap_size: "1g"