Fix bug to be idempotent in case of multiple same type records

For example, domains often have multiple MX or TXT records for the root part of the domain. To have the outcome of the module be idempotent also sort on content of the record.

library/transip_dns.py

@@ -79,8 +79,8 @@ def main():
         existing_records = fetch_dns_records(request_headers, domain)
 
         # Sort the records before comparing, order doesn't matter for DNS records
-        existing_records.sort(key=lambda x: (x['name'], x['type']), reverse=False)
-        records.sort(key=lambda x: (x['name'], x['type']), reverse=False)
+        existing_records.sort(key=lambda x: (x['name'], x['type'], x['content']), reverse=False)
+        records.sort(key=lambda x: (x['name'], x['type'], x['content']), reverse=False)
 
         # Only perform an update if the DNS entries differ
         if existing_records != records: