Switch from squid to apt-cacher-ng and from shorewall to firewalld.

roles/apt-cacher/files/apt.conf

@@ -0,0 +1 @@
+Acquire::http::Proxy "http://localhost:3142";

roles/apt-cacher/handlers/main.yml

@@ -0,0 +1,3 @@
+- name: start apt-cacher-ng
+  service: name=apt-cacher-ng state=started enabled=yes
+  listen: "start apt-cacher-ng"

roles/apt-cacher/tasks/main.yml

@@ -0,0 +1,13 @@
+- name: install apt-cacher-ng package
+  apt:
+    name: apt-cacher-ng
+    state: latest
+
+- name: enable apt-cacher-ng for localhost
+  copy:
+    src: apt.conf
+    dest: /etc/apt/apt.conf
+    backup: yes
+  notify: "start apt-cacher-ng"
+
+- meta: flush_handlers