selftests: forwarding: vxlan_bridge_1d: use more proper tos value

0x11 and 0x12 set the ECN bits based on RFC2474, it would be better to avoid
that. 0x14 and 0x18 would be better and works as well.
Reported-by: NPetr Machata <petrm@mellanox.com>
Fixes: 4e867c9a ("selftests: forwarding: vxlan_bridge_1d: fix tos value")
Signed-off-by: NHangbin Liu <liuhangbin@gmail.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

tools/testing/selftests/net/forwarding/vxlan_bridge_1d.sh

@@ -516,9 +516,9 @@ test_tos()
 	RET=0
 
 	tc filter add dev v1 egress pref 77 prot ip \
-		flower ip_tos 0x11 action pass
-	vxlan_ping_test $h1 192.0.2.3 "-Q 0x11" v1 egress 77 10
-	vxlan_ping_test $h1 192.0.2.3 "-Q 0x12" v1 egress 77 0
+		flower ip_tos 0x14 action pass
+	vxlan_ping_test $h1 192.0.2.3 "-Q 0x14" v1 egress 77 10
+	vxlan_ping_test $h1 192.0.2.3 "-Q 0x18" v1 egress 77 0
 	tc filter del dev v1 egress pref 77 prot ip
 
 	log_test "VXLAN: envelope TOS inheritance"