Log Message:
Update devel/librdkafka to 0.11.1.

Noteworthy critical bug fixes
- Fix OpenSSL instability on Windows (fix thread id callback) - the
  bug resulted in SSL connections being torn down for no apparent
  reason.
- Fetch response fix: read all MessageSets, not just the first one.

Enhancements
- Add api.version.request.timeout.ms
- Point users to documentation when attempting to use Java security
  properties

Fixes:
- Adjust log level for partial message reads when debug is enabled
- Allow app metadata() requests regardless of outstanding metadata
  requests
- Proper size calculation from flags2str to include nul
- Thread-safe rd_strerror()
- Proper re-sends of ProduceRequests in-transit on connection down
- Producer: invalid offsets reported back when
  produce.offset.report=false
- Consumer: Message Null Key/Value were messed up
- Fix metadata querying for topics with LEADER_UNAVAIL set
- Treat request __TIMED_OUT as a retryable error
- Let timed out ProduceRequests result in MSG_TIMED_OUT error code for
  messages
- Fix crash on leader rejoin when outstanding assignor metadata
- sasl_cyrus: Fix dangling stack ptr to sasl_callback_t