librdkafka v1.8.2

librdkafka v1.8.2 is a maintenance release.

Enhancements

Added ssl.ca.pem to add CA certificate by PEM string. (#2380)
Prebuilt binaries for Mac OSX now contain statically linked OpenSSL v1.1.1l.
Previously the OpenSSL version was either v1.1.1 or v1.0.2 depending on
build type.

The librdkafka.redist 1.8.0 package had two flaws:
- the linux-arm64 .so build was a linux-x64 build.
- the included Windows MSVC 140 runtimes for x64 were infact x86.
  The release script has been updated to verify the architectures of
  provided artifacts to avoid this happening in the future.
Prebuilt binaries for Mac OSX Sierra (10.12) and older are no longer provided.
This affects confluent-kafka-go.
Some of the prebuilt binaries for Linux were built on Ubuntu 14.04,
these builds are now performed on Ubuntu 16.04 instead.
This may affect users on ancient Linux distributions.
It was not possible to configure ssl.ca.location on OSX, the property
would automatically revert back to probe (default value).
This regression was introduced in v1.8.0. (#3566)
librdkafka's internal timers would not start if the timeout was set to 0,
which would result in some timeout operations not being enforced correctly,
e.g., the transactional producer API timeouts.
These timers are now started with a timeout of 1 microsecond.

Upon quick repeated leader changes the transactional producer could receive
an OUT_OF_ORDER_SEQUENCE error from the broker, which triggered an
Epoch bump on the producer resulting in an InitProducerIdRequest being sent
to the transaction coordinator in the middle of a transaction.
This request would start a new transaction on the coordinator, but the
producer would still think (erroneously) it was in current transaction.
Any messages produced in the current transaction prior to this event would
be silently lost when the application committed the transaction, leading
to message loss.
This has been fixed by setting the Abortable transaction error state
in the producer. #3575.
The transactional producer could stall during a transaction if the transaction
coordinator changed while adding offsets to the transaction (send_offsets_to_transaction()).
This stall lasted until the coordinator connection went down, the
transaction timed out, transaction was aborted, or messages were produced
to a new partition, whichever came first. #3571.

Release asset checksums:

v1.8.2.zip SHA256 8b03d8b650f102f3a6a6cff6eedc29b9e2f68df9ba7e3c0f3fb00838cce794b8
v1.8.2.tar.gz SHA256 6a747d293a7a4613bd2897e28e8791476fbe1ae7361f2530a876e0fd483482a6

Note: there was no v1.8.1 librdkafka release