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This change implements GetNetworkTrafficAnnotationTag and
GenerateBroadcastPacket. These are helper methods that support the
NETBIOS packet protocol.

Bug: chromium:757625
Change-Id: I839498187ca823b919c08b3e224f9b76fc1fd471
Reviewed-on: https://chromium-review.googlesource.com/1062938Reviewed-by: Zentaro Kavanagh <zentaro@chromium.org>
Commit-Queue: Bailey Berro <baileyberro@chromium.org>
Cr-Commit-Position: refs/heads/master@{#566026}