Consider rebalance_timeout on join request #943
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This PR resolves #941.
As the coordinator waits for each member to rejoin when rebalancing the group, the timeout of join request should be greater than rebalance_timeout.
cf. https://kafka.apache.org/protocol.html#The_Messages_JoinGroup
Otherwise, each member might send join requests over and over, and as a result, the following problems occur: