scaleway: Add common documentation fragment

Every scaleway modules will require the same base of parameters. Instead
of documenting it each and every time, we build a doc fragment that will
allow one to simply extend documentation for every new module.

extends_documentation_fragment: scaleway

lib/ansible/utils/module_docs_fragments/scaleway.py

@@ -0,0 +1,29 @@
+# -*- coding: utf-8 -*-
+# Copyright (C) 2018 Yanis Guenane <yanis+ansible@guenane.org>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+
+class ModuleDocFragment(object):
+
+    # Standard documentation fragment
+    DOCUMENTATION = '''
+options:
+  oauth_token:
+    description:
+      - Scaleway OAuth token.
+    aliases: ['api_token']
+  timeout:
+    description:
+      - HTTP timeout to Scaleway API in seconds.
+    default: 30
+  validate_certs:
+    description:
+      - Validate SSL certs of the Scaleway API.
+    default: yes
+    type: bool
+notes:
+  - Also see the API documentation on U(https://developer.scaleway.com/)
+  - If parameters are not set within the module, the following
+    environment variables can be used in decreasing order of precedence
+    C(SCW_TOKEN), C(SCW_API_KEY) or C(SCW_OAUTH_TOKEN).
+'''