ring: netsniff-ng: migrate capture only to TPACKET_V3

Lets migrate capturing to TPACKET_V3, since it will bring a better
performance due to fewer page cache misses caused by a higher density
of packets, since now they are contigous placed in the ring buffer.

It is said that TPACKET_V3 brings the following benefits:

 *) ~15 - 20% reduction in CPU-usage
 *) ~20% increase in packet capture rate
 *) ~2x increase in packet density
 *) Port aggregation analysis
 *) Non static frame size to capture entire packet payload

Signed-off-by: Daniel Borkmann <dborkman@redhat.com>

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