[dts] [PATCH V1] fix NameError on latest scapy 2.4.2

[Li, WenjieX A]

Fix the issue of scapy 2.4: "NameError: name 'ETHER_TYPES' is not defined"
And it does not affect scapy 2.2/2.3. 

Tested-by: Li, WenjieX A <wenjiex.a.li at intel.com> 

> -----Original Message-----
> From: dts [mailto:dts-bounces at dpdk.org] On Behalf Of xiao,qimai
> Sent: Thursday, May 23, 2019 7:10 PM
> To: dts at dpdk.org
> Cc: Xiao, QimaiX <qimaix.xiao at intel.com>
> Subject: [dts] [PATCH V1] fix NameError on latest scapy 2.4.2
> 
> fix NameError: name 'ETHER_TYPES' is not defined on scapy 2.4.2
> 
> Signed-off-by: xiao,qimai <qimaix.xiao at intel.com>
> ---
>  dep/Dot1BR.py | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/dep/Dot1BR.py b/dep/Dot1BR.py index f985f6a..114c19a 100644
> --- a/dep/Dot1BR.py
> +++ b/dep/Dot1BR.py
> @@ -13,6 +13,7 @@ VBPE (virtual brige port extenstion)  from scapy.packet
> import *  from scapy.fields import *  from scapy.layers.l2 import Ether
> +from scapy.data import ETHER_TYPES
> 
>  class Dot1BR(Packet):
>      name = "802.1BR"
> --
> 2.17.1