func (r *raftNode) advanceTicks(ticks int) {
	for i := 0; i < ticks; i++ {
		r.tick()
	}
}
func (r *raftNode) advanceTicks(ticks int) {
	for i := 0; i < ticks; i++ {
		r.tick()
	}
}
// advanceTicks advances ticks of Raft node.
// This can be used for fast-forwarding election
// ticks in multi data-center deployments, thus
// speeding up election process.