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Do not enable UDP checksum offloading when running on the Hyper-V on

Description

Do not enable UDP checksum offloading when running on the Hyper-V on
Windows Server 2012 and earlier hosts.

Submitted by: whu
Reviewed by: royger
Approved by: royger
MFC after: 3 days
Relnotes: No
Sponsored by: Microsoft OSTC
Differential Revision: https://reviews.freebsd.org/D3086