Remove unused unit test implementation

This shard example is not called.

Change-Id: I6cf46b846dea3d1b6cf533e947caa1f6ca50fb51

spec/classes/neutron_agents_l3_spec.rb

@@ -168,13 +168,6 @@ describe 'neutron::agents::l3' do
     end
   end
 
-  shared_examples 'neutron::agents::l3 on Debian' do
-    it 'configures neutron-l3 package subscription' do
-      should contain_service('neutron-l3').that_subscribes_to('Anchor[neutron::service::begin]')
-      should contain_service('neutron-l3').that_notifies('Anchor[neutron::service::end]')
-    end
-  end
-
   on_supported_os({
     :supported_os => OSDefaults.get_supported_os
   }).each do |os,facts|