mxrouter: Create interfaces before applying settings

Interface-specific settings (ipv4_send_redirects, ipv4_rp_filter,
ipv6_accept_ra) were applied to early, when new vlan interfaces
not yet existed.

Change order of code blocks.

mxrouter/mxrouterctl

@@ -481,6 +481,17 @@ sub start {
 		set_ipv4_routing(1);
 	}
 
+	stop_process_if($process_ulogd);
+	stop_process_if($process_dhcrelay);
+	stop_process_if($process_radvd);
+	unconfigure_route($del_route);
+	unconfigure_ip($del_addr);
+	unconfigure_vlans($del_vlan,{});
+
+	configure_vlans($new_vlan,{});
+	configure_ip($new_addr);
+	configure_route($new_route);
+
 	for my $dev ('all','default',network_devices()) {
 		if (get_ipv4_send_redirects($dev)>0) {
 			warn "disable IPV4 send redirects on $dev\n" unless $opt_quiet;
@@ -502,16 +513,6 @@ sub start {
 		}
 	}
 
-	stop_process_if($process_ulogd);
-	stop_process_if($process_dhcrelay);
-	stop_process_if($process_radvd);
-	unconfigure_route($del_route);
-	unconfigure_ip($del_addr);
-	unconfigure_vlans($del_vlan,{});
-
-	configure_vlans($new_vlan,{});
-	configure_ip($new_addr);
-	configure_route($new_route);
 	start_process_if($process_ulogd);
 	start_process_if($process_dhcrelay);
 	start_process_if($process_radvd);