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Change the default close timeout for [Producer, AdminClient]#close

This approach has an advantage in fixing the default close timeout inconsistency between Consumer and Producer, AdminClient. However, this inconsistency was intended; The current `KafkaConsumer#close`'s default timeout, 30 seconds, was introduced in KIP-102 (0.10.2.0). To summarize, there are two differences between Consumer and Producer;

1. Consumers don't have large requests.
2. Consumer#close is affected by consumer coordinator, whose close operation is affected by request.timeout.ms.

By the above reasons, Consumer's default timeout was set a little bit different. So, we don't need to align the parity.

Moreover, this approach does not allow the users to configure a close timeout, and breaks backward compatibility. So rejected.

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