bgpd, zebra: Fix format for some metric outputs

Metrics are unsigned values.

  * bgpd/bgp_{debug,route,vty}.c,
  * zebra/zebra_vty.c: replace %d with %u for metrics & distances

Signed-off-by: Jorge Boncompte [DTI2] <jorge@dti2.net>
[reworded commit message]
Signed-off-by: David Lamparter <equinox@diac24.net>
4 files changed