Fix package_provider for RedHat systems

The package_provider parameter of the rabbitmq defaults to 'rpm'
which can give dependecy problems, this patch sets it to yum which
addresses this potential problems.

Conflicts:
	manifests/messaging.pp

Change-Id: I8dde5c0c22d227a6b48a53a09952450449e6bd53

spec/classes/cloud_messaging_spec.rb

@@ -42,6 +42,7 @@ describe 'cloud::messaging' do
           :node_ip_address          => params[:rabbitmq_ip],
           :erlang_cookie            => params[:erlang_cookie],
           :port                     => '5672',
+          :package_provider         => platform_params[:package_provider],
         )
     end
 
@@ -96,6 +97,10 @@ describe 'cloud::messaging' do
       { :osfamily => 'Debian' }
     end
 
+    let :platform_params do
+      { :package_provider => 'apt' }
+    end
+
     it_configures 'openstack messaging'
   end
 
@@ -104,6 +109,11 @@ describe 'cloud::messaging' do
       { :osfamily => 'RedHat' }
     end
 
+
+    let :platform_params do
+      { :package_provider => 'yum' }
+    end
+
     let :params do
       { :erlang_cookie => 'MY_COOKIE' }
     end