datatype: ll: use big endian byte ordering

datatype: ll: use big endian byte ordering

ether daddr set 00:03:2d:2b:74:ec  is listed as:
ether daddr set ec:74:2b:2d:03:00

(it was fine without 'set' keyword).  Reason is that
ether address was listed as being HOST endian.

The payload expression (unlike statement) path contains
a few conversion call sites for this, i.e.:

if (tmp->byteorder == BYTEORDER_HOST_ENDIAN)
   mpz_switch_byteorder(tmp->value, tmp->len / BITS_PER_BYTE);

... it might make sense to remove those in a followup patch.

Reported-by: Laura Garcia Liebana <nevola@gmail.com>
Signed-off-by: Florian Westphal <fw@strlen.de>
Acked-by: Pablo Neira Ayuso <pablo@netfilter.org>