dns_zone: make rname relative to zone origin

library/dns_zone.py

@@ -32,7 +32,9 @@ class RName(dns.name.Name):
             raise ValueError(
                 "Invalid e-mail address format: {}".format(address)
             )
-        super().__init__((local,) + dns.name.from_text(domain).labels)
+        super().__init__(
+            (local,) + dns.name.from_text(domain, origin=dns.name.empty).labels
+        )
 
 
 class MultiRecords: