meta: fix pkttype name and add 'other' symbol

meta: fix pkttype name and add 'other' symbol

'unicast' doesn't check for unicast packets; it checks for PACKET_HOST,
i.e. a packet coming in for this host.

A unicast address to some other machine (e.g. because nic is
in promisc mode) will have PACKET_OTHER.

So at best this is misleading, so this patch changes it
to 'host'.  The unicast entry is retained for compat purpose.

Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>