datatype: Replace getaddrinfo() by internal lookup table

datatype: Replace getaddrinfo() by internal lookup table

Nftables uses a internal service table to print service names. This
table should be used when parsing new rules, to avoid conflicts between
nft service table and the local /etc/services, when loading an exported
ruleset.

Closes: https://bugzilla.netfilter.org/show_bug.cgi?id=1118
Fixes: ccc5da4 ("datatype: Replace getnameinfo() by internal lookup table")
Signed-off-by: Elise Lennion <elise.lennion@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>