[tutorial Rougail 1.2] a port variable

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

Add the env_proxy.port variable

---
env_proxy:
  host: proxy.example.net
  port: "3128"

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

1/ INVALID only with rougail:

---
env_proxy:
  host: proxy.example.net
  port: 3128

2/ INVALID, port is missing:

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

Rougail/socle/03-proxy.yml

@@ -16,3 +16,8 @@ env_proxy:
     type: domainname
     test:
       - proxy.silique.fr
+  port:
+    description: The proxy server's port
+    type: port
+    test:
+      - "3128"