Bug#734324: disable keyring in second stage

[jhcha54008 <jhcha54008@free.fr>]

Hi,

Would the following patch suffice ?

Thanks for your comments or corrections !

Regards,
JH Chatenet

diff -Naur a/usr/share/debootstrap/scripts/sid b/usr/share/debootstrap/scripts/sid
--- a/usr/share/debootstrap/scripts/sid	2014-03-13 20:30:32.000000000 +0100
+++ b/usr/share/debootstrap/scripts/sid	2014-03-13 20:29:02.000000000 +0100
@@ -2,7 +2,9 @@
 download_style apt
 finddebs_style from-indices
 variants - buildd fakechroot minbase scratchbox
-keyring /usr/share/keyrings/debian-archive-keyring.gpg
+if [ "$SECOND_STAGE_ONLY" != "true" ] ; then
+	keyring /usr/share/keyrings/debian-archive-keyring.gpg
+fi
 
 if doing_variant fakechroot; then
 	test "$FAKECHROOT" = "true" || error 1 FAKECHROOTREQ "This variant requires fakechroot environment to be started"