[airos] specify both location and mantainer from netjson

Author: edoput

docs/source/backends/airos.rst

@@ -56,6 +56,20 @@ JSON method
 General settings
 ----------------
 
+From the ``general`` key we can configure the contact and the location for a device using the ``contact`` and ``location`` properties.
+
+The following snippet specify both contact and location:
+
+.. code-block:: json
+
+    {
+        "type": "DeviceConfiguration",
+        "general": {
+            "contact": "user@example.com",
+            "location": "Up in the roof"
+        }
+    }
+
 Network interface
 -----------------
 

netjsonconfig/backends/airos/converters.py

@@ -489,12 +489,13 @@ class Snmp(AirOsConverter):
     netjson_key = 'general'
 
     def to_intermediate(self):
+        original = get_copy(self.netson, self.netjson_key)
         result = [
-            {
-                'community': 'public',
-                'contact': '',
-                'location': '',
-                'status': 'enabled',
+           {
+                'community':  'public',
+                'contact':  original.get('mantainer', ''),
+                'location':  original.get('location', ''),
+                'status':  'enabled',
             },
         ]
         return (('snmp', result),)