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As part of the network servicification project, this CL replaces the use
of net/ sockets in the PrivetTrafficDetector class with the UDP socket
interfaces in the network service.

Bug: 811497
Change-Id: I0f0295f032684b0e6a32de222760cfeb409c7d21
Reviewed-on: https://chromium-review.googlesource.com/1127268Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Helen Li <xunjieli@chromium.org>
Commit-Queue: Lily Houghton <lilyhoughton@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577225}