[PATCH] improve overrun handling NFLOG

This patch improves the overrun handling. The NFLOG plugin duplicates
the netlink buffer size if the size does not goes after the upper
boundary. This patch also introduces two new clauses, the
netlink_socket_buffer_size and netlink_socket_buffer_maxsize that set
the size of the netlink socket buffer.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>

-- 
"Los honestos son inadaptados sociales" -- Les Luthiers