Pull request: 2504 querylog interval

Merge in DNS/adguard-home from 2504-querylog-ivl to master

Updates #2504.

Squashed commit of the following:

commit 5d15a6f735cd195fc81c8af909b56fbc7db1fe21
Merge: 8cd5c30d 97073d0d
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Jul 1 18:45:10 2021 +0300

    Merge branch 'master' into 2504-querylog-ivl

commit 8cd5c30de6f72d4b12162dbc9e3d90132795fe94
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Jul 1 18:35:50 2021 +0300

    client: fix fmt

commit e95d462c31d886bacec0735acc567fec7c962149
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Jul 1 17:58:06 2021 +0300

    home: imp code

commit 48737b249c52a997a4f34dac45fbaf699477b007
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Jul 1 17:23:18 2021 +0300

    home: imp duration

commit 44f5dc3d3ada5120d74caa24cace9a253b8f15d3
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Jul 1 16:55:31 2021 +0300

    home: imp code, docs

commit bb2826521b7e5d248ce2ab686528219c312b8ba2
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Jul 1 16:11:40 2021 +0300

    all: imp code, docs

commit d688aed1f340807a8bac8807c263956b0fc16f5b
Author: Eugene Burkov <e.burkov@adguard.com>
Date:   Thu Jul 1 13:49:42 2021 +0300

    all: change querylog interval setting format

openapi/openapi.yaml

@@ -2008,8 +2008,15 @@
           'type': 'boolean'
           'description': 'Is query log enabled'
         'interval':
-          'type': 'integer'
-          'description': 'Time period to keep data (1 | 7 | 30 | 90)'
+          'description': >
+            Time period for query log rotation.
+          'type': 'number'
+          'enum':
+          - 0.25
+          - 1
+          - 7
+          - 30
+          - 90
         'anonymize_client_ip':
           'type': 'boolean'
           'description': "Anonymize clients' IP addresses"