[tutorial Rougail 1.3] default variable

Proxy configuration
===================

env_proxy.port has a default value
with ansible we needs to define a new mapping variable: env_proxy_all

Examples of Ops inventory file
==============================

1/ VALID:

---
env_proxy:
  host: proxy.example.net

2/ VALID:

---
env_proxy:
  host: proxy.example.net
  port: "3129"

Rougail/socle/03-proxy.yml

@@ -19,5 +19,4 @@ env_proxy:
   port:
     description: The proxy server's port
     type: port
-    test:
-      - "3128"
+    default: "3128"