pyrocufflink: Configure sudo for server admins

Members of the *Server Admins* AD group need to be able to use `sudo`
for privilege elevation on all domain member servers.

pyrocufflink.yml

@@ -3,8 +3,16 @@
   - winbind
   - nsswitch
   - system-auth
+  - sudo
   tasks:
   - name: ensure winbind is running
     service:
       name=winbind
       state=started
+  - name: ensure server admins can use sudo
+    copy:
+      dest: /etc/sudoers.d/20_server-admins
+      content: |
+        %server\ admins ALL=(ALL) ALL
+      mode: '0440'
+      validate: visudo -cf %s