Hetzner failover IP: refactoring (#56203)

* Rename helper function.

* Extract hetzner.py module_utils.

* Rewrite docs.

* Add module docs fragment.

* Split up get_failover function.

* Add tests for new function.

* hetzner_pass -> hetzner_password

* Move common argspec to module_utils.

lib/ansible/plugins/doc_fragments/hetzner.py

@@ -0,0 +1,20 @@
+# -*- coding: utf-8 -*-
+
+# Copyright: (c) 2019 Felix Fontein <felix@fontein.de>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+
+
+class ModuleDocFragment(object):
+
+    # Standard files documentation fragment
+    DOCUMENTATION = r'''
+options:
+  hetzner_user:
+    description: The username for the Robot webservice user.
+    type: str
+    required: yes
+  hetzner_password:
+    description: The password for the Robot webservice user.
+    type: str
+    required: yes
+'''