Move apt configuration to hiera.

Hopefully this will allow other resources to include or require apt,
without us erroring due to it already being defined.

data/os/debian.yaml

+apt::purge:
+  sources.list:   true
+  sources.list.d: true
+  preferences:    true
+  preferences.d:  true

hiera.yaml

+---
+version: 5
+
+defaults:  # Used for any hierarchy level that omits these keys.
+  datadir: data         # This path is relative to hiera.yaml's directory.
+  data_hash: yaml_data  # Use the built-in YAML backend.
+
+hierarchy:
+  - name: "osfamily/major release"
+    paths:
+        # Used to distinguish between Debian and Ubuntu
+      - "os/%{facts.os.name}/%{facts.os.release.major}.yaml"
+      - "os/%{facts.os.family}/%{facts.os.release.major}.yaml"
+        # Used for Solaris
+      - "os/%{facts.os.family}/%{facts.kernelrelease}.yaml"
+  - name: "osfamily"
+    paths:
+      - "os/%{facts.os.name}.yaml"
+      - "os/%{facts.os.family}.yaml"
+  - name: 'common'
+    path: 'common.yaml'

manifests/base/repo/debian.pp

@@ -7,14 +7,8 @@ class packages::base::repo::debian (
   $repos = join($repo_list, ' ')
   $dist = $facts['os']['distro']['codename']
 
-  class { '::apt':
-    purge => {
-      'sources.list'   => true,
-      'sources.list.d' => true,
-      'preferences'    => true,
-      'preferences.d'  => true,
-    }
-  }
+  include ::apt
+
 
   apt::source { $dist:
     location => "${ftp_proto}://${ftp_host}/debian/",