BUGFIX starting jail with dhcp

cmd/start.go

@@ -1448,7 +1448,7 @@ func StartJail(args []string) {
 		fmt.Printf("  > Setup VNet network: OK\n")
 		
 		// Set default route, unless main network is dhcp
-		if ! cj.isFirstNetDhcp() {
+		if ! cj.isFirstNetDhcp() && !strings.EqualFold(cj.Config.Ip4_addr, "none") {
 			fmt.Printf("  > Setup default ipv4 gateway:\n")
 			cmd := fmt.Sprintf("/usr/sbin/setfib %s /usr/sbin/jexec %d route add default %s", cj.Config.Exec_fib, cj.JID, cj.Config.Defaultrouter)
 			out, err := executeCommand(cmd)