Skip processing srv_to_leave_ on replaying old configs
#110
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* If `srv_to_leave_` is NULL on removing server in reconfigure, that means Raft is replaying old log, and there is no current request by user. In such case, we can skip the logic handling `srv_to_leave_`.
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srv_to_leave_is NULL on removing server in reconfigure, thatmeans Raft is replaying old log, and there is no current request by
user. In such case, we can skip the logic handling
srv_to_leave_.