1.4.4:
Bugfixes
* (Attempt to) Fix deadlock between consumer and heartbeat
* Fix Metrics dict memory leak
Client
* Support Kafka record headers
* Set socket timeout for the write-side of wake socketpair
* Add kerberos domain name config for gssapi sasl mechanism handshake
* Support smaller topic metadata fetch during bootstrap
* Use TypeError for invalid timeout type
* Break poll if closed
Admin Client
* Add KafkaAdminClient class
* Fix list_consumer_groups() to query all brokers
* Stop using broker-errors for client-side problems
* Fix send to controller
* Add group coordinator lookup
* Fix describe_groups
* Add list_consumer_group_offsets()
* Remove support for api versions as strings from KafkaAdminClient
* Set a clear default value for validate_only/include_synonyms
* Bugfix: Always set this_groups_coordinator_id
Consumer
* Fix linter warning on import of ConsumerRebalanceListener
* Remove ConsumerTimeout
* Return future from commit_offsets_async()
Core / Protocol
* Add protocol structs for {Describe,Create,Delete} Acls
* Pre-compile pack/unpack function calls
* Don't use kafka.common internally
* Be explicit with tuples for %s formatting
Documentation
* Document connections_max_idle_ms
* Fix sphinx url
* Update remote urls: snappy, https, etc
* Minor cleanup of testing doc
* Various docstring / pep8 / code hygiene cleanups
Test Infrastructure
* Stop pinning pylint
* (partial) Migrate from Unittest to pytest
* Minor aesthetic cleanup of partitioner tests
* Cleanup fixture imports
* Fix typo in test file name
* Remove unused ivy_root variable
* Add test fixtures for kafka versions 1.0.2 -> 2.0.1
* Bump travis test for 1.x brokers to 1.1.1
Logging / Error Messages
* raising logging level on messages signalling data loss
* Stop using deprecated log.warn()
* Fix typo in logging message
Compatibility
* Vendor enum34
* Bump vendored six to 1.11.0
* Vendor six consistently
* Prevent pylint import errors on six.moves
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