Log Message:
Update devel/librdkafka to 0.11.0.

Features
- Added support for MsgVersion v2 (message format of KIP-98) - message
  format compatible with EOS clients
- Added support for client interceptors
- Added support for dynamically loaded plugins (plugin.library.paths,
  for use with interceptors)
- Added SASL SCRAM support (KIP-84)
- Added builtin SASL PLAIN provider (for Win32, #982)

Enhancements
- Deprecate errno usage, use rd_kafka_last_error() instead.
- Deprecate rd_kafka_wait_destroyed().
- Implemented per-partition Fetch backoffs, previously all partitions
  for the given broker were backed off.
- Added updated Kafka protocol and error enums
- Added rd_kafka_message_latency()
- Added rd_kafka_clusterid() and rd_kafka_type()
- SSL: set default CA verify locations if ssl.ca.location is not
  specified
- C++: add yield() method
- Added support for stats as events (#1171)
- Build with system liblz4 if available, else fall back on built-in
  lz4, for improved portability.
- Use SNI when connecting through SSL (@vincentbernat)
- Improve broker thread responsiveness, decreasing internal latency
- Improve OpenSSL config error propagation (#1119)
- Prioritize all relevant user-facing ops (callbacks) over messages on
  poll queue (#1088)
- Added global->topic config fallthru: default topic config properties
- can now be set effortlessly on global config object.
- Log offset commit failures when there is no offset_commit_cb (closes
  #1043)
- Add CRC checking support to consumer (#1056)
- C++: Added seek() support to KafkaConsumer
- Added rd_kafka_conf_dup_filter() to selectively copy a config
  object.

Fixes:
- Avoid _ALIGN re-definition on BSD (#1225)
- rdkafka_performance: exit with code 1 if not all messages were
  delivered
- Fix endianism issues that were causing snappy to compress
  incorrectly (#1219, @rthalley)
- Fix stability on AIX (#1211)
- Document that rd_kafka_message_errstr() must not be used on producer
- Add support for re-queuing half-processed ops to honour yield()
- Handle null Protocol in JoinGroupResponse (#1193)
- Consumer: Proper relative offset handling (#1192, @rthalley)
- OSX: silence libsasl deprecated warnings
- partition count should be per topic in offset request buffer (closes
  #1199, @matthew-d-jones)
- fix build on SmartOS (#1186 by @misterdjules)
- ERR_remove_thread_state OpenSSL version checking
- Don't emit TIMED_OUT_QUEUE for timed out messages (revert)
- producev() default partition should UA, not 0 (#1153)
- Fix SaslHandshakeRequest timeout to 10s
- SASL: fix memory leak: received SASL auth frames were not freed
- Clean up OpenSSL per-thread memory on broker thread exit
- Properly auto-set metadata.max.age.ms when
  metadata.refresh.interval.ms is disabled (closes #1149)
- Fix memory alignment issues (#1150)
- configure: auto add brew openssl pkg-config path
- Fix consumer_lag calculation (don't use cached hi_offset)
- rdkafka_example: fix message_errstr usage, not allowed on producer
- Avoid use of partially destroyed topic object (#1125)
- Improve reconnect delay handling (#1089)
- C++: fix conf->get() allocation (closes #1118)
- Use app_offset to calculate consumer_lag (closes #1112)
- Fix retrybuf memory leak on termination when broker is down
- Fix small memory leak in metadata_leader_query
- Fix use-after-free when log.queue and debug was used
- consumer_example: fix crash on -X dump (closes #841)
- Added rd_kafka_offsets_store() (KafkaConsumer::offsets_store)
  (closes #826)
- Optimize broker id lookups (closes #523)
- Don't log broker failures when an error_cb is registered (closes
  #1055)
- Properly log SSL connection close (closes #1081)
- Win32 SASL GSSAPI: protection level and message size were not sent
- C++: improved error reporting from Conf::set()
- Flush partition fetch buffer on seek (from decide())
- Fix recursive locking on periodic refresh of leader-less partition
  (closes #1311)