Re-factor source for laternc into it's own class

manifests/bureau.pp

@@ -41,29 +41,8 @@ class alternc::bureau (
     content => template('alternc/alternc.response.erb'),
   }
   if ($manage_sources) {
-    # Upstream hasn't released anything into the stretch archives
-    # or later. 2018.06.08
-    if ($facts['os']['lsb']['majdistrelease'] >= '8') {
-      $release = 'jessie'
-    }
-    else {
-      $release = $facts['os']['lsb']['distcodename']
-    }
-    apt::source { 'alternc':
-      location => 'http://debian.alternc.org',
-      release  => $release,
-      key      => {
-        id     => '54E9B3EC75A6375C4670104BA4AFB8B58971F6F2',
-        source => 'https://debian.alternc.org/key.txt',
-      },
-      repos    => 'main',
-    }
-    Apt::Source['alternc']
-    -> Package['alternc']
-    Apt::Source['alternc']
-    ~> Class[Apt::Update]
+    include alternc::source
   }
-
   package { 'acl':
     ensure => present,
   }

manifests/source.pp

@@ -0,0 +1,23 @@
+class alternc::source {
+  # Upstream hasn't released anything into the stretch archives
+  # or later. 2018.06.08
+  if ($facts['os']['lsb']['majdistrelease'] >= '8') {
+    $release = 'jessie'
+  }
+  else {
+    $release = $facts['os']['lsb']['distcodename']
+  }
+  apt::source { 'alternc':
+    location => 'http://debian.alternc.org',
+    release  => $release,
+    key      => {
+      id     => '54E9B3EC75A6375C4670104BA4AFB8B58971F6F2',
+      source => 'https://debian.alternc.org/key.txt',
+    },
+    repos    => 'main',
+  }
+  Apt::Source['alternc']
+  -> Package['alternc']
+  Apt::Source['alternc']
+  ~> Class[Apt::Update]
+}