Merge in DNS/adguard-home from 2301-dhcp-check to master Closes #2301. Squashed commit of the following: commit bf5c31b8592f909a372fcdaebacc491d310cc3e6 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Fri Nov 13 14:28:54 2020 +0300 dhcpd: fix possible infinite loop, set timeouts better