Backport improvements to recordset module

- General refactoring of module
- Move recordset specific tests from the dns role to new recordset role
- Adds additional tests to recordset role

Note that this is not a clean cherry pick due to sdk changes

Change-Id: If8fda40780050d271c9d869d8959ef569644fd88
(cherry picked from commit 97b05533f1)

ci/roles/recordset/defaults/main.yml

@@ -0,0 +1,19 @@
+dns_zone_name: test.dns.zone.
+recordset_name: testrecordset.test.dns.zone.
+records: ['10.0.0.0']
+updated_records: ['10.1.1.1']
+
+recordset_fields:
+  - action
+  - created_at
+  - description
+  - id
+  - links
+  - name
+  - project_id
+  - records
+  - status
+  - ttl
+  - type
+  - zone_id
+  - zone_name