Add REPLICASET_DNS to basic.inc servers array

Author: jmikola

tests/utils/basic.inc

@@ -20,6 +20,7 @@ $servers = array(
     "STANDALONE_PLAIN" => "",
     "REPLICASET"       => "",
     "REPLICASET_30"    => "",
+    "REPLICASET_DNS"   => "",
 );
 $servers = array_merge($servers, $config);
 def($servers);