**Describe the bug**
`SYSTEM KILL` does not shutdown the server when run in a docker environment. I used https://hub.docker.com/r/yandex/clickhouse-server/ instructions to setup the docker.

**How to reproduce**
* ClickHouse server version 20.12.4 revision 54442.
```
myrotk@altinity-qa-cosmic3:~$ docker pull yandex/clickhouse-server
Using default tag: latest
latest: Pulling from yandex/clickhouse-server
da7391352a9b: Pull complete
14428a6d4bcd: Pull complete
2c2d948710f2: Pull complete
076cd2c6a81e: Pull complete
201ea6cda8c8: Pull complete
0d7b4e598027: Pull complete
0d86a58e3639: Pull complete
3b78a4fd0f92: Pull complete
86d65487f611: Pull complete
dc82dea7d6fe: Pull complete
Digest: sha256:8f669dafd35eb527210cc77973ed927734dff2c2cafd345823c8c99769124fd1
Status: Downloaded newer image for yandex/clickhouse-server:latest
docker.io/yandex/clickhouse-server:latest

myrotk@altinity-qa-cosmic3:~$ docker run -d --name some-clickhouse-server --ulimit nofile=262144:262144 yandex/clickhouse-server
35603911ec6c5737f069a019a60d03270cefe78e52c77d1bc6ff33a0548ae97e

myrotk@altinity-qa-cosmic3:~$ docker run -it --rm --link some-clickhouse-server:clickhouse-server yandex/clickhouse-client --host clickhouse-server
Unable to find image 'yandex/clickhouse-client:latest' locally
latest: Pulling from yandex/clickhouse-client
f22ccc0b8772: Pull complete
3cf8fb62ba5f: Pull complete
e80c964ece6a: Pull complete
6f064a173914: Pull complete
37a06aaf9ee5: Pull complete
Digest: sha256:504e18bed5162a20bbff6071ca1b7c7baca1380d2e2755e4d6bf4bac7e534531
Status: Downloaded newer image for yandex/clickhouse-client:latest
ClickHouse client version 20.12.4.5 (official build).
Connecting to clickhouse-server:9000 as user default.
Connected to ClickHouse server version 20.12.4 revision 54442.

35603911ec6c :) SYSTEM KILL

SYSTEM KILL

Query id: 0da8cfef-36c8-4de9-8c12-3e9175c5aed0

Ok.

0 rows in set. Elapsed: 0.002 sec.

35603911ec6c :)



auto access = context.getAccess();
        for (auto & elem : DatabaseCatalog::instance().getDatabases())
        {
            for (auto iterator = elem.second->getTablesIterator(context); iterator->isValid(); iterator->next())
            {
                StoragePtr table = iterator->table();
                if (!table)
                    continue;
                if (!access->isGranted(getRequiredAccessType(action_type), elem.first, iterator->name()))
                {
                    LOG_INFO(
                        log,
                        "Access {} denied, skipping {}.{}",
                        toString(getRequiredAccessType(action_type)),
                        elem.first,
                        iterator->name());
                    continue;
                }
                if (start)
                {
                    manager->remove(table, action_type);
                    table->onActionLockRemove(action_type);
                }
                else
                    manager->add(table, action_type);
            }
        }
    }
}
InterpreterSystemQuery::InterpreterSystemQuery(const ASTPtr & query_ptr_, Context & context_)