OVS Agent with ML2: fix symlink on RH plateforms

Change the symlink to ensure
/etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini points to
/etc/neutron/plugins/ml2/ml2_conf.ini .

/etc/neutron/plugin.ini is not managed by the RH package (OVS neutron
plugin by default) so the OVS agent won't load it.

Source: https://bugzilla.redhat.com/show_bug.cgi?id=1087647

Change-Id: I89364a215eff28652ab424b30911f6bd348f1d47
Closes-bug: #1425213
(cherry picked from commit 163e631895bb0c9f98f11f3f2ff3d99b1f449b49)

Author: EmilienM

manifests/agents/ml2/ovs.pp

@@ -221,7 +221,7 @@
       # instead of the ml2 config file.
       file { '/etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini':
         ensure => link,
-        target => '/etc/neutron/plugin.ini'
+        target => '/etc/neutron/plugins/ml2/ml2_conf.ini'
       } ~> Service<| title == 'neutron-ovs-agent-service' |>
     }
   }

spec/classes/neutron_agents_ml2_ovs_spec.rb

@@ -214,7 +214,7 @@
     it 'links from ovs config to plugin config' do
       should contain_file('/etc/neutron/plugins/openvswitch/ovs_neutron_plugin.ini').with(
         :ensure => 'link',
-        :target => '/etc/neutron/plugin.ini'
+        :target => '/etc/neutron/plugins/ml2/ml2_conf.ini'
       )
     end
   end