Added checksum for PacketOut to avoid invalid packet

[gran-vmv]

No description provided.

[antrea-bot]

Thanks for your PR.
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[gran-vmv]

/test-all

[jianjuns]

LGTM

[antoninbas]

LGTM. A potentially related question: should we verify the checksum for traceflow packets received as "packetins"?

[gran-vmv]

/test-windows-networkpolicy

[gran-vmv]

LGTM. A potentially related question: should we verify the checksum for traceflow packets received as "packetins"?

That sounds a good idea. Added this into work item list for further discussion.

[tnqn]

LGTM