net: shell: Fix the output of route command

Print route information by groupping them for each network
interface like this:

IPv6 routes for interface 0xa8007140
====================================
IPv6 prefix : 2001:db8::212:4b00:0:3/128
        neighbor  : 0xa80065e0
        link addr : 00:12:4B:00:00:00:00:03
IPv6 prefix : 2001:db8::212:4b00:0:1/128
        neighbor  : 0xa8006660
        link addr : 00:12:4B:00:00:00:00:01

Signed-off-by: Jukka Rissanen <[email protected]>

Author: jukkar

subsys/net/ip/net_shell.c

@@ -269,17 +269,12 @@ static void route_cb(struct net_route_entry *entry, void *user_data)
 		return;
 	}
 
-	printk("IPv6 Route %p for interface %p\n", entry, iface);
-	printk("==============================================\n");
-
 	printk("IPv6 prefix : %s/%d\n",
 	       net_sprint_ipv6_addr(&entry->addr),
 	       entry->prefix_len);
 
 	count = 0;
 
-	printk("Next hops   :\n");
-
 	SYS_SLIST_FOR_EACH_CONTAINER(&entry->nexthop, nexthop_route, node) {
 		struct net_linkaddr_storage *lladdr;
 
@@ -311,6 +306,9 @@ static void iface_per_route_cb(struct net_if *iface, void *user_data)
 {
 	ARG_UNUSED(user_data);
 
+	printk("IPv6 routes for interface %p\n", iface);
+	printk("====================================\n");
+
 	net_route_foreach(route_cb, iface);
 }
 #endif /* CONFIG_NET_ROUTE */