Fixes for prepared statements.

* CLICKHOUSE-4514 Unique query_id among all users

* try 1

* Fix

* fix

* use condvar

* fix style

* Update ProcessList.cpp

Fixed GCC minor version in libhdfs3-cmake

Fix shutdown of SystemLogs

Merge pull request #5801 from yandex/thread-pool-cannot-schedule-a-task-more-informative-error-message

Thread pool: more informative error message for "cannot schedule a task"

ThreadPool: more informative error message if exception is thrown before we schedule a next thread #5305

Merge branch 'feature/bloom_filter' of https://github.com/zhang2014/ClickHouse into zhang2014-feature/bloom_filter

Update Kafka table-engine EN docs

Performance vision ignore scheme

Kafka.md change