bgpd: Reflect the distance in RIB when it is changed for an arbitrary afi/safi

bgpd: Reflect the distance in RIB when it is changed for an arbitrary afi/safi

debian-9# show ip route 192.168.255.2/32 longer-prefixes
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued route, r - rejected route

B>* 192.168.255.2/32 [20/0] via 192.168.0.1, eth1, 00:15:22
debian-9# conf
debian-9(config)# router bgp 100
debian-9(config-router)# address-family ipv4
debian-9(config-router-af)# distance bgp 123 123 123
debian-9(config-router-af)# do show ip route 192.168.255.2/32 longer-prefixes
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued route, r - rejected route

B>* 192.168.255.2/32 [123/0] via 192.168.0.1, eth1, 00:00:09
debian-9(config-router-af)# no distance bgp
debian-9(config-router-af)# do show ip route 192.168.255.2/32 longer-prefixes
Codes: K - kernel route, C - connected, S - static, R - RIP,
       O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
       T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
       F - PBR, f - OpenFabric,
       > - selected route, * - FIB route, q - queued route, r - rejected route

B>* 192.168.255.2/32 [20/0] via 192.168.0.1, eth1, 00:00:02
debian-9(config-router-af)#

Signed-off-by: Donatas Abraitis <donatas.abraitis@gmail.com>