src: Add support for pkttype in meta expresion

If you want to match the pkttype field of the skbuff, you have to
use the following syntax:

 nft add rule ip filter input meta pkttype PACKET_TYPE

where PACKET_TYPE can be: unicast, broadcast and multicast.

Joint work with Alvaro Neira Ayuso <alvaroneay@gmail.com>

Signed-off-by: Alvaro Neira Ayuso <alvaroneay@gmail.com>
Signed-off-by: Ana Rey <anarey@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

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