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CAdd changelog for backporting of 19.7 and 19.9

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CHANGELOG.md
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## ClickHouse release 19.9.4.1, 2019-07-05
### Bug Fix
* Fix potential infinite sleeping of low-priority queries. [#5842](https://github.com/yandex/ClickHouse/pull/5842) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Fix rare bug in checking of part with LowCardinality column. [#5832](https://github.com/yandex/ClickHouse/pull/5832) ([alesapin](https://github.com/alesapin))
* Fix ClickHouse determines default time zone as UCT instead of UTC. [#5828](https://github.com/yandex/ClickHouse/pull/5828) ([alexey-milovidov](https://github.com/alexey-milovidov))
* Fix bug about executing distributed DROP/ALTER/TRUNCATE/OPTIMIZE ON CLUSTER queries on follower replica before leader replica. Now they will be executed directly on leader replica. [#5757](https://github.com/yandex/ClickHouse/pull/5757) ([alesapin](https://github.com/alesapin))
* Fix segfault in Delta codec which affects columns with values less than 32 bits size. The bug led to random memory corruption. [#5786](https://github.com/yandex/ClickHouse/pull/5786) ([alesapin](https://github.com/alesapin))
* Fix race condition, which cause that some queries may not appear in query_log after SYSTEM FLUSH LOGS query. [#5802](https://github.com/yandex/ClickHouse/pull/5802) ([Anton Popov](https://github.com/CurtizJ))
* Fix segfault in TTL merge with non-physical columns in block. [#5819](https://github.com/yandex/ClickHouse/pull/5819) ([Anton Popov](https://github.com/CurtizJ))
* Added missing support for constant arguments to evalMLModel function. [#5820](https://github.com/yandex/ClickHouse/pull/5820) ([alexey-milovidov](https://github.com/alexey-milovidov))
## ClickHouse release 19.7.6.1, 2019-07-05
### Bug Fix
* Fix push require columns with join. [#5192](https://github.com/yandex/ClickHouse/pull/5192) ([Winter Zhang](https://github.com/zhang2014))
## ClickHouse release 19.9.2.4, 2019-06-24
### New Feature