Merge in DNS/adguard-home from 2304-dncp-backoff to master
Updates #2304.
Squashed commit of the following:
commit c9bff8b27c6b031d43a7dd98152adcde7f49fff1
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Fri Nov 27 14:08:03 2020 +0300
dhcpd: try for 5s instead of 10s
commit 983cf471832de0e7762b8b6e0a4ba9bb76ecadfc
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date: Wed Nov 25 19:58:41 2020 +0300
dhcpd: wait for interfaces' ip addresses to appear
