added default ttl

poweradmin/poweradmin-2.1.7/inc/config.inc.php

@@ -14,3 +14,4 @@ $iface_lang   = 'en_EN';
 $dns_hostmaster   = 'DNS_HOSTMASTER';
 $dns_ns1    = 'DNS_NS1';
 $dns_ns2    = 'DNS_NS2';
+$dns_ttl = 600;