Trigger the election immediately when doing a manual failover #1081
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Currently when a manual failover is triggeded, we will set a
CLUSTER_TODO_HANDLE_FAILOVER to start the election as soon as
possible in the next beforeSleep. But in fact, we won't delay
the election in manual failover, waitting for the next beforeSleep
to kick in will delay the election a some milliseconds.
We can trigger the election immediately in this case in the
same function call, without waitting for beforeSleep, which
can save us some milliseconds.