Add ability to create system users.

users/init.sls

@@ -72,6 +72,9 @@ include:
     {% if 'password' in user -%}
     - password: '{{ user['password'] }}'
     {% endif -%}
+    {% if user.get('system', False) -%}
+    - system: True
+    {% endif -%}
     {% if 'prime_group' in user and 'gid' in user['prime_group'] -%}
     - gid: {{ user['prime_group']['gid'] }}
     {% else -%}
@@ -252,4 +255,3 @@ googleauth-{{ svc }}-{{ name }}:
 {{ group }}:
   group.absent
 {% endfor %}
-