bgpd: Print hostname for peer as well when marking as stale for route-refresh

bgpd: Print hostname for peer as well when marking as stale for route-refresh

Before:

```
2022/09/26 10:13:35.261 BGP: [QCZ1W-VKS36] 192.168.0.1(r0) sending REFRESH_REQ for afi/safi: IPv4/unicast
2022/09/26 10:13:35.262 BGP: [VF3QY-FP1PP] 192.168.0.1: route-refresh for IPv4/unicast, marking prefix 172.16.1.1/32 as stale
2022/09/26 10:13:35.262 BGP: [VF3QY-FP1PP] 192.168.0.1: route-refresh for IPv4/unicast, marking prefix 192.168.0.0/24 as stale
2022/09/26 10:13:35.262 BGP: [SDZS7-XVC4W] 192.168.0.1(r0) rcvd route-refresh (BoRR) for IPv4/unicast, triggering timer for 360 seconds
2022/09/26 10:13:35.362 BGP: [Y6XKR-PF89P] 192.168.0.1(r0) rcvd route-refresh (EoRR) for IPv4/unicast, stopping BoRR timer
```

Signed-off-by: Donatas Abraitis <donatas@opensourcerouting.org>