Merge in DNS/adguard-home from 2688-dhcp-opt-ip to master
Updates #2688.
Squashed commit of the following:
commit e17e003a3a61c1f4ed55617bb61df721cbca12c1
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Tue Feb 16 17:10:32 2021 +0300
dhcpd: fix ip option parsing