Adding manage_service parameter to all services

When set to false, enables puppet to configure a service without
starting/stopping it on each run.  This may be necessary when
using an external clustering system (Corosync/Pacemaker, for
example).  Defaults to true.

Change-Id: Ia5b36d9e03bfc4905394bba4fb9873750664b118

spec/classes/neutron_agents_dhcp_spec.rb

@@ -72,6 +72,15 @@ describe 'neutron::agents::dhcp' do
       )
     end
 
+    context 'with manage_service as false' do
+      before :each do
+        params.merge!(:manage_service => false)
+      end
+      it 'should not start/stop service' do
+        should contain_service('neutron-dhcp-service').without_ensure
+      end
+    end
+
     context 'when enabling isolated metadata only' do
       before :each do
         params.merge!(:enable_isolated_metadata => true, :enable_metadata_network => false)