continuous: Fix configuration step for newer kernels

It is not sufficient to always answer no. The "choice" question needs
Enter or a number. We answer with Enter.

continuous/steps/20-config

@@ -62,4 +62,4 @@ conf NETFILTER y
 
 conf PACKET y # ugw mmap
 
-timeout 2m yes n|chronic make oldconfig
+chronic ../my-oldconfig.pl

continuous/steps/my-oldconfig.pl

+#!/usr/bin/perl -w
+
+use Expect;
+my $exp = Expect->spawn("make oldconfig")
+    or die "Cannot spawn make oldconfig: $!\n";
+
+my $timeout = 1;
+$exp->expect($timeout,
+	     [ '^ *choice\[.*\]: '           => sub { $exp->send("\n");  exp_continue; } ],
+	     [ '^([^ ]| *[^>0-9]).*\(NEW\) ' => sub { $exp->send("n\n"); exp_continue; } ],
+	     [ "configuration written to .config" ],
+    ) || die "Timeout"