Add more addons functions. (#91)

* Add more addons functions.

* fix lint

* fix lint p2

* Allow more customable network settings

* fix lint

* change point of validate

* fix lint

* fix handling

* fix lint & validate data before write

API.md

@@ -303,6 +303,7 @@ Output the raw docker log
 {
     "name": "xy bla",
     "description": "description",
+    "auto_update": "bool",
     "url": "null|url of addon",
     "detached": "bool",
     "repository": "12345678|null",
@@ -312,6 +313,8 @@ Output the raw docker log
     "boot": "auto|manual",
     "build": "bool",
     "options": "{}",
+    "network": "{}|null",
+    "host_network": "bool"
 }
 ```
 
@@ -319,10 +322,16 @@ Output the raw docker log
 ```json
 {
     "boot": "auto|manual",
+    "auto_update": "bool",
+    "network": {
+      "CONTAINER": "port|[ip, port]"
+    },
     "options": {},
 }
 ```
 
+For reset custom network settings, set it `null`.
+
 - POST `/addons/{addon}/start`
 
 - POST `/addons/{addon}/stop`