coreos/etcd — pull request #577 by unihorn (2014-02-17 04:28:35+00:00)
Title: chore: rename 'heartbeat timeout' to 'heartbeat interval'

Heartbeat timeout means the period length that indicates heartbeat is
out of service, which is different from heartbeat interval.

So we should use '-peer-heartbeat-interval' instead of
'-peer-heartbeat-timeout' in etcd.

@houqp