Pull request: 3166 fix dhcp

Updates #3166.

Squashed commit of the following:

commit cac62f842886f06a70fb50d251938e0feaa06846
Author: Ildar Kamalov <ik@adguard.com>
Date:   Thu Jun 10 14:35:40 2021 +0300

    client: get dhcp status on static lease submit

commit 2ae4e3ab40041fbc0f53f4902a00263425409a6a
Merge: 1e0f9c15 299ea88c
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Jun 10 14:09:05 2021 +0300

    Merge branch 'master' into 3166-fix-dhcp

commit 1e0f9c15d98f40a499c75b74bca48fe58512e300
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Jun 10 14:03:58 2021 +0300

    dhcpd: imp code

commit e4b9626b60a11cd2491c675a297f527f7e12f9b4
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Jun 10 13:03:47 2021 +0300

    dhcpd: fix static lease load

commit dc449f21986a8ea300d07c081f1e416b2f08bc25
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Tue Jun 1 17:21:10 2021 +0300

    home: change clients sources priority

CHANGELOG.md

@@ -47,6 +47,8 @@ released by then.
 
 ### Fixed
 
+- Redundant hostname generating while loading static leases with empty hostname
+  ([#3166]).
 - Domain name case in responses ([#3194]).
 - Custom upstreams selection for clients with client IDs in DNS-over-TLS and
   DNS-over-HTTP ([#3186]).
@@ -61,6 +63,7 @@ released by then.
 [#2443]: https://github.com/AdguardTeam/AdGuardHome/issues/2443
 [#2763]: https://github.com/AdguardTeam/AdGuardHome/issues/2763
 [#3136]: https://github.com/AdguardTeam/AdGuardHome/issues/3136
+[#3166]: https://github.com/AdguardTeam/AdGuardHome/issues/3166
 [#3172]: https://github.com/AdguardTeam/AdGuardHome/issues/3172
 [#3184]: https://github.com/AdguardTeam/AdGuardHome/issues/3184
 [#3185]: https://github.com/AdguardTeam/AdGuardHome/issues/3185