Add manage_service feature

puppet-heat lacks of disabling service managing. This patch adds
$manage_service parameter to all relevant classes.

Closes-bug: #1359823
Change-Id: I54245b39f3484ccdb9910aa0fa4c8dc2bae3f0ce

spec/classes/heat_engine_spec.rb

@@ -4,6 +4,7 @@ describe 'heat::engine' do
 
   let :default_params do
     { :enabled                       => true,
+      :manage_service                => true,
       :heat_stack_user_role          => 'heat_stack_user',
       :heat_metadata_server_url      => 'http://127.0.0.1:8000',
       :heat_waitcondition_server_url => 'http://127.0.0.1:8000/v1/waitcondition',
@@ -38,7 +39,7 @@ describe 'heat::engine' do
       it { should contain_package('heat-engine').with_name(os_params[:package_name]) }
 
       it { should contain_service('heat-engine').with(
-        :ensure     => expected_params[:enabled] ? 'running' : 'stopped',
+        :ensure     => (expected_params[:manage_service] && expected_params[:enabled]) ? 'running' : 'stopped',
         :name       => os_params[:service_name],
         :enable     => expected_params[:enabled],
         :hasstatus  => 'true',
@@ -56,6 +57,26 @@ describe 'heat::engine' do
       it { should contain_heat_config('DEFAULT/heat_watch_server_url').with_value( expected_params[:heat_watch_server_url] ) }
       it { should contain_heat_config('DEFAULT/engine_life_check_timeout').with_value( expected_params[:engine_life_check_timeout] ) }
     end
+
+    context 'with disabled service managing' do
+      before do
+        params.merge!({
+          :manage_service => false,
+          :enabled        => false })
+      end
+
+      it { should contain_service('heat-engine').with(
+        :ensure     => nil,
+        :name       => os_params[:service_name],
+        :enable     => false,
+        :hasstatus  => 'true',
+        :hasrestart => 'true',
+        :require    => [ 'File[/etc/heat/heat.conf]',
+                         'Package[heat-common]',
+                         'Package[heat-engine]'],
+        :subscribe  => 'Exec[heat-dbsync]'
+      ) }
+    end
   end
 
   context 'on Debian platforms' do