Simplify ml2_config.ini symlink resource management

Move file resource outside conditional so it's managed once and
manage dependencies in conditional instead.

Change-Id: I56b30173db4a56cf3ad211a9656c628977eec99b
(cherry picked from commit 763ec35)

manifests/plugins/ml2.pp

@@ -108,26 +108,23 @@
     warning('Without networking mechanism driver, ml2 will not communicate with L2 agents')
   }
 
+  # In RH, the link is used to start Neutron process but in Debian,
+  # it's used only to manage database synchronization.
+  file {'/etc/neutron/plugin.ini':
+    ensure  => link,
+    target  => '/etc/neutron/plugins/ml2/ml2_conf.ini'
+  }
+
   # Some platforms do not have a dedicated ml2 plugin package
-  # In RH, the link is used to start Neutron process but in Debian, it's used only
-  # to manage database synchronization.
   if $::neutron::params::ml2_server_package {
     package { 'neutron-plugin-ml2':
       ensure => present,
       name   => $::neutron::params::ml2_server_package,
     }
     Package['neutron-plugin-ml2'] -> Neutron_plugin_ml2<||>
-    file {'/etc/neutron/plugin.ini':
-      ensure  => link,
-      target  => '/etc/neutron/plugins/ml2/ml2_conf.ini',
-      require => Package['neutron-plugin-ml2']
-    }
+    Package['neutron-plugin-ml2'] -> File['/etc/neutron/plugin.ini']
   } else {
-      file {'/etc/neutron/plugin.ini':
-        ensure  => link,
-        target  => '/etc/neutron/plugins/ml2/ml2_conf.ini',
-        require => Package['neutron']
-      }
+    Package['neutron'] -> File['/etc/neutron/plugin.ini']
   }
 
   neutron::plugins::ml2::driver { $type_drivers: