some refactoring, externalizing classes

manifests/puppetlabs_apt.pp

@@ -0,0 +1,8 @@
+class puppet::puppetlabs_apt ($ensure = 'present') {
+  apt::source { 'puppetlabs':
+    key      => '4BD6EC30',
+    location => 'http://apt.puppetlabs.com',
+    repos    => 'main',
+    ensure   => $ensure,
+  }
+}