Add gandi_livedns module (#328)

* Add gandi_livedns module

This module uses REST API to register, update and delete domain name
entries in Gandi DNS service (https://www.gandi.net/en/domain).

* Apply suggestions from code review

* Update plugins/module_utils/gandi_livedns_api.py

Co-authored-by: Gregory Thiemonge <greg@thiemonge.org>
Co-authored-by: Felix Fontein <felix@fontein.de>

tests/integration/targets/gandi_livedns/defaults/main.yml

@@ -0,0 +1,34 @@
+# Copyright: (c) 2020 Gregory Thiemonge <gregory.thiemonge@gmail.com>
+# GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt)
+---
+gandi_livedns_domain_name: "ansible-tests.org"
+gandi_livedns_record_items:
+# Single A record
+- record: test-www
+  type: A
+  values:
+      - 10.10.10.10
+  ttl: 400
+  update_values:
+      - 10.10.10.11
+  update_ttl: 800
+
+# Multiple A records
+- record: test-www-multiple
+  type: A
+  ttl: 3600
+  values:
+      - 10.10.11.10
+      - 10.10.11.10
+  update_values:
+      - 10.10.11.11
+      - 10.10.11.13
+
+# CNAME
+- record: test-cname
+  type: CNAME
+  ttl: 10800
+  values:
+      - test-www2
+  update_values:
+      - test-www