etcd-tester: enable initial corrupt check by default

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

tools/functional-tester/etcd-tester/member.go

@@ -47,6 +47,7 @@ func (m *member) Flags() []string {
 		"--listen-peer-urls", m.PeerURL,
 		"--initial-advertise-peer-urls", m.PeerURL,
 		"--initial-cluster-state", "new",
+		"--experimental-initial-corrupt-check",
 	}
 }