bgpd: fix negative values in output

Negative value in output of ecommunities (and as numbers)
seems odd :-). This patch fixes it. And add minor formating
modification, better for big as numbers.

Signed-off-by: Milan Kocian <milon@wq.cz>
Signed-off-by: David Lamparter <equinox@opensourcerouting.org>
2 files changed