[base] Deploy basic packages

base.yml

 ---
 # Playbook to deploy common Crans configuration and tools
 - hosts: all
-  roles: []  # TODO
+  roles:
+    - common-tools

roles/common-tools/tasks/main.yml

+---
+- name: Install common tools
+  apt:
+    update_cache: true
+    name:
+      - sudo
+      - molly-guard  # prevent reboot
+      - ntp  # network time sync
+      - apt  # better than apt-get
+      - rsync  # backuppc
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+