Test against many chef 12.x versions, include DSL

Make sure the recipe DSL is available for the install provider, which needs to `include_recipe` for ark and curl.

Fixes #371. Fixes #372.

.kitchen.yml

@@ -8,9 +8,6 @@
 driver:
   name: vagrant # provide a default test-kitchen driver, vagrant
 
-driver_config:
-  require_chef_omnibus: true # 11.18.12
-
 provisioner:
   name: chef_zero
   nodes_path: 'test/fixtures/nodes'
@@ -36,11 +33,41 @@ platforms:
 
 suites:
   - name: default # the normal use-case
+    require_chef_omnibus: 12.4.1
     run_list:
       - recipe[java]
       - recipe[elasticsearch_test::default_with_plugins]
 
   - name: elasticsearch_test # the override-everything use case
+    driver_config:
+      require_chef_omnibus: 12.4.1
     run_list:
       - recipe[java]
       - recipe[elasticsearch_test::default]
+
+  - name: chef-12.3.0
+    driver_config:
+      require_chef_omnibus: 12.3.0
+    includes:
+      - ubuntu-14.04
+    run_list:
+      - recipe[java]
+      - recipe[elasticsearch_test::default_with_plugins]
+
+  - name: chef-12.2.1
+    driver_config:
+      require_chef_omnibus: 12.2.1
+    includes:
+      - ubuntu-14.04
+    run_list:
+      - recipe[java]
+      - recipe[elasticsearch_test::default_with_plugins]
+
+  - name: chef-12.1.2
+    driver_config:
+      require_chef_omnibus: 12.1.2
+    includes:
+      - ubuntu-14.04
+    run_list:
+      - recipe[java]
+      - recipe[elasticsearch_test::default_with_plugins]

README.md

@@ -1,7 +1,7 @@
 # Elasticsearch Chef Cookbook
 
 This cookbook has been converted into a library cookbook as of version 1.0.0,
-and supports Chef 12.x and higher. It implements supports CI as well as more
+and supports Chef 12.4.1, 12.3.0, 12.2.1, and higher. It implements supports CI as well as more
 modern testing with chefspec and test-kitchen. It no longer supports some of
 the more extraneous features such as discovery (use [chef search](http://docs.chef.io/chef_search.html)
 in your wrapper cookbook) or EBS device creation (use

libraries/provider_install.rb

@@ -4,6 +4,7 @@ class Chef
   # downloaded from elasticsearch.org and installed by package manager or ark resource
   class Provider::ElasticsearchInstall < Chef::Provider::LWRPBase
     include ElasticsearchCookbook::Helpers
+    include Chef::DSL::IncludeRecipe
     provides :elasticsearch_install if respond_to?(:provides)
 
     action :install do