Improve KafkaConsumer group rejoin / disable heartbeats during join group #1695
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Fixes #1691 and applies fixes based on upstream java client:
(1) rejoin_needed is reset to False in final success callback, not in the JoinResponse callback.
(2) also check that join_future is not pending in ensure_active_group
(3) disable heartbeats during join group
See also: KAFKA-3782, KAFKA-5611
This change is