Prefix files with numbers as recommended by docs

See "systemd.netdev" docs.

global/overlay/etc/puppet/modules/cdn/manifests/cache.pp

@@ -39,24 +39,24 @@ class cdn::cache(
     content => template('cdn/cache/varnish-slash-seccomp.json.erb'),
   }
 
-  file { '/etc/systemd/network/cdn-dummy.netdev':
+  file { '/etc/systemd/network/10-cdn-dummy.netdev':
     ensure  => file,
     owner   => 'root',
     group   => 'root',
     mode    => '0644',
-    content => template('cdn/cache/cdn-dummy.netdev.erb'),
+    content => template('cdn/cache/10-cdn-dummy.netdev.erb'),
   }
 
-  file { '/etc/systemd/network/cdn-dummy.network':
+  file { '/etc/systemd/network/10-cdn-dummy.network':
     ensure  => file,
     owner   => 'root',
     group   => 'root',
     mode    => '0644',
-    content => template('cdn/cache/cdn-dummy.network.erb'),
+    content => template('cdn/cache/10-cdn-dummy.network.erb'),
   }
   # Reload the network config if it has changed
   exec { 'networkctl reload':
-    subscribe   => File['/etc/systemd/network/cdn-dummy.network'],
+    subscribe   => File['/etc/systemd/network/10-cdn-dummy.network'],
     refreshonly => true,
   }