add aliases copy task to common play

ubuntu/roles/common/files/aliases

@@ -0,0 +1,3 @@
+# See man 5 aliases for format
+postmaster:    root
+root: s+cron@sadiqs.com

ubuntu/roles/common/handlers/main.yml

@@ -3,3 +3,5 @@
   service: name=rsyslog state=restarted
 - name: restart cron
   service: name=cron state=restarted
+- name: newaliases
+  shell: newaliases

ubuntu/roles/common/tasks/main.yml

@@ -69,3 +69,7 @@
      - chrony
 - name: Ensure that the periodic APT cron task clears out old kernels and does unattended security upgrades
   copy: src=10periodic dest=/etc/apt/apt.conf.d/10periodic backup=yes owner=root group=root mode=0644
+- name: Copy over our aliases file
+  copy: src=aliases dest=/etc/aliases
+  notify:
+    - newaliases