Do not check localhost DNS resolution.

tests/test_dns_records.py

@@ -95,7 +95,7 @@ services_info = (
 
 for conf_name, default_domain, package in services_info:
     domain = conf.get(conf_name)
-    if domain and domain != default_domain:
+    if domain and domain not in ('localhost', default_domain):
         # check that the service is installed on this system
         status, output = subprocess.getstatusoutput('dpkg -s %s' % package)
         if status == 0: