Add a temp workaround for an issue #153 in rabbit cookbook

After configuring rabbitmq, restart the service to make configuration
take effect. So during OpenStack deployment, OpenStack services can
connect to rabbitmq successfully.
This workaround will notify rabbitmq-server to restart immediately.
This could be remove once the issue #153 is fixed in rabbit cookbook.

Change-Id: Ib017226f46c7e26429bb26df5b63525e1a98bc82
Closes-Bug: #1380940

CHANGELOG.md

@@ -7,6 +7,8 @@ This file is used to list changes made in each version of cookbook-openstack-ops
 * Fix metadata version constraint for common
 * Bump Chef gem to 11.16
 * No need to push our rabbit user/password to rabbit cookbook
+* Add a temp workaround for an issue #153 in rabbit cookbook to notify
+  rabbitmq-server to restart immediately.
 
 ## 10.0.0
 * Upgrading to Juno

recipes/rabbitmq-server.rb

@@ -100,3 +100,9 @@ rabbitmq_user 'set rabbit administrator tag' do
 
   action :set_tags
 end
+
+# TODO(wenchma) This could be removed once the issue is fixed in rabbitmq cookbook.
+# Issue: https://github.com/kennonkwok/rabbitmq/issues/153
+# Notifies rabbitmq-server service restart.
+r = resources(template: "#{node['rabbitmq']['config_root']}/rabbitmq.config")
+r.notifies(:restart, "service[#{node['rabbitmq']['service_name']}]", :immediately)

spec/rabbitmq-server_spec.rb

@@ -124,6 +124,14 @@ describe 'openstack-ops-messaging::rabbitmq-server' do
             'set rabbit administrator tag'
           ).with(user: 'not-a-guest', tag: 'administrator')
         end
+
+        describe 'notifies immediately' do
+          let(:template) { chef_run.template('/etc/rabbitmq/rabbitmq.config') }
+
+          it 'sends the specific notification to the service immediately' do
+            expect(template).to notify('service[rabbitmq-server]').to(:restart).immediately
+          end
+        end
       end
     end
   end