Use absolute domain in detection of A/AAAA records

Python dns resolver append configured domain to queries which may lead
to false positive answer.

Exmaple: resolving "ipa.example.com" may return records for
"ipa.example.com.example.com" if domain is configured as "example.com"

https://fedorahosted.org/freeipa/ticket/5421

Reviewed-By: Petr Spacek <pspacek@redhat.com>

ipalib/plugins/dns.py

@@ -4189,16 +4189,12 @@ class dns_resolve(Command):
 
     takes_args = (
         Str('hostname',
-            label=_('Hostname'),
+            label=_('Hostname (FQDN)'),
         ),
     )
 
     def execute(self, *args, **options):
         query=args[0]
-        if query.find(api.env.domain) == -1 and query.find('.') == -1:
-            query = '%s.%s.' % (query, api.env.domain)
-        if query[-1] != '.':
-            query = query + '.'
 
         if not is_host_resolvable(query):
             raise errors.NotFound(