Openapi Schema improvements

- Return proper booleans in api responses
- Update jsonschemavalidation to latest draft

backend/schema/paths/nginx/access-lists/listID/get.json

@@ -30,7 +30,7 @@
 								"id": 1,
 								"created_on": "2020-01-30T09:36:08.000Z",
 								"modified_on": "2020-01-30T09:41:04.000Z",
-								"is_disabled": 0,
+								"is_disabled": false,
 								"email": "jc@jc21.com",
 								"name": "Jamie Curnow",
 								"nickname": "James",