update: restart always & async icinga conf

roles/docker-deployments/templates/async-icinga-config.json.j2

@@ -1,10 +1,8 @@
-[
+{ 
 {% for service in async_icinga_static_services %}
-    { 
-        "{{ service['name'] }}" : {
-            "timeout" : "{{ service['timeout'] }}",
-            "token"   : "{{ service['token'] }}"
-        }
+    "{{ service['name'] }}" : {
+        "timeout" : "{{ service['timeout'] }}",
+        "token"   : "{{ service['token'] }}"
     }{% if not loop.last %},{% endif %}
 {% endfor %}
-]
+}