Updates #3027. Squashed commit of the following: commit 171ebaecb4b96ebeb2d0fa350460c65f244e94ae Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Thu Apr 29 14:45:04 2021 +0300 all: imp docs commit 48b13ed5b435042a0622a66b60407116ae5aa288 Author: Ainar Garipov <A.Garipov@AdGuard.COM> Date: Thu Apr 29 14:34:28 2021 +0300 dhcpd: normalize hostnames of invalid static leases