Special updated Firmware 7.1.2 and 6.3.5 with EDNS compliance

[TK_Liew]

@SamuelNorris, please find the feedback below.

Peplink DNS, DNSSEC, EDNS

@HA13029 The latest version 8.0 beta 2 is not included the enhancement yet. Confirmed with Engineering team version 8.0 GA will included the feature. We will have the special firmware for 7.1.2 that compliance with EDNS, DNSSEC this week. We will post the download link here when the firmware is ready.