Fix consul deprecation of fields

ansible/system_roles/consul/templates/config_bootstrap.json.j2

@@ -28,11 +28,16 @@
   "enable_local_script_checks": true,
   "disable_update_check" : true,
   {% if consul_acl_enable -%}
-    "acl_datacenter": "{{ consul_acl_datacenter }}",
-    "acl_default_policy": "{{ consul_acl_default_policy }}",
-    "acl_down_policy": "{{ consul_acl_down_policy }}",
-    "acl_master_token": "{{ consul_master_token }}",
-    "acl_replication_token": "{{ consul_replication_token }}"
+    "primary_datacenter": "{{ consul_acl_datacenter }}",
+    "acl": {
+      "enabled": true,
+      "default_policy": "{{ consul_acl_default_policy }}",
+      "down_policy": "{{ consul_acl_down_policy }}",
+      "tokens": {
+        "master": "{{ consul_master_token }}",
+        "replication": "{{ consul_replication_token }}"
+      }
+    }
   {% endif -%},
   "limits": {
       "http_max_conns_per_client": 1000