librdkafka
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[KIP-848] Fix static group membership
there are three cases for static group membership this PR fixes the first one:
- member explicitly unsubscribes -> should cause a rebalance
- member closes the consumer -> no rebalance
- member destroys the consumer -> no rebalance
When a new member joins the group and there's already a member with same group instance id that hasn't left statically the new member is fenced with the new protocol
[!WARNING] The test won't work until regex implementation is merged