* Add write-callback on each row for RowOutputStream
* Fix build of new rdkafka library
* Poll messages if Kafka outgoing queue is full
* Add test
* Add test producer-consumer
* Truncate delimiter from last row in message
* Fix build
* cmake: fix cpuinfo
* Fix includes after processors merge
Conflicts:
dbms/src/Processors/Formats/Impl/CapnProtoRowInputFormat.cpp
dbms/src/Processors/Formats/Impl/ParquetBlockOutputFormat.cpp
dbms/src/Processors/Formats/Impl/ProtobufRowInputFormat.cpp
dbms/src/Processors/Formats/Impl/ProtobufRowOutputFormat.cpp
* Fix build in gcc8
* fix test link
* fix test link
* Fix test link
* link fix
* Fix includes after processors merge 2
Conflicts:
dbms/src/Processors/Formats/Impl/ParquetBlockInputFormat.cpp
* Fix includes after processors merge 3
* link fix
* Fix likely/unlikely conflict with cython
* Fix conflict with protobuf/stubs/atomicops.h
* remove unlikely.h
* Fix macos build (do not use timer_t)
