USHIFT-3177: Use only ipv4 addresses for default router

There was a mismatch between what the config package IP addresses from
the host and the router controller. The config package only gets ipv4
addresses while the router controller takes ipv6 too. This caused a
mismatch between allowed/configured IP addresses that triggered fake
warning logs about ipv6 entries not allowed in the service (even if
they were not configured).

pkg/loadbalancerservice/router.go

@@ -123,7 +123,7 @@ func ipAddressesFromNIC(name string) ([]string, error) {
 		return nil, err
 	}
 
-	addrList, err := netlink.AddrList(link, netlink.FAMILY_ALL)
+	addrList, err := netlink.AddrList(link, netlink.FAMILY_V4)
 	if err != nil {
 		return nil, err
 	}