integration: set InitialElectionTickAdvance to true by default

Signed-off-by: Gyuho Lee <gyuhox@gmail.com>

integration/cluster.go

@@ -573,6 +573,7 @@ func mustNewMember(t *testing.T, mcfg memberConfig) *member {
 		m.ServerConfig.PeerTLSInfo = *m.PeerTLSInfo
 	}
 	m.ElectionTicks = electionTicks
+	m.InitialElectionTickAdvance = true
 	m.TickMs = uint(tickDuration / time.Millisecond)
 	m.QuotaBackendBytes = mcfg.quotaBackendBytes
 	m.MaxTxnOps = mcfg.maxTxnOps