When calling snap-seed-parse append stdout to file, but redirect

stderr to stdout, thus unbreak autopkgtests.

debian/changelog

@@ -1,8 +1,13 @@
 livecd-rootfs (2.544) UNRELEASED; urgency=medium
 
+  [ Steve Langasek ]
   * Properly fix the hard-linking of vmlinuz, taken astray by my misguided
     merge review.
 
+  [ Dimitri John Ledkov ]
+  * When calling snap-seed-parse append stdout to file, but redirect
+    stderr to stdout, thus unbreak autopkgtests.
+
  -- Steve Langasek <steve.langasek@ubuntu.com>  Fri, 02 Nov 2018 14:46:30 -0700
 
 livecd-rootfs (2.543) disco; urgency=medium

live-build/auto/build

@@ -550,8 +550,9 @@ if [ "$PROJECT" = "ubuntu-touch" ] || [ "$PROJECT" = "ubuntu-touch-custom" ]; th
 fi
 
 # '--initramfs none' produces different manifest names.
+# NB! we want stdout appended to the manifest, yet stderr to be printed on stdout
 if [ -e "binary/$INITFS/filesystem.packages" ]; then
-	./config/snap-seed-parse "chroot/" >> "binary/${INITFS}/filesystem.packages"
+	./config/snap-seed-parse "chroot/" 2>&1 >> "binary/${INITFS}/filesystem.packages"
 	ln "binary/$INITFS/filesystem.packages" "$PREFIX.manifest"
 	chmod 644 "$PREFIX.manifest"
 fi

live-build/functions

@@ -43,13 +43,14 @@ create_empty_disk_image() {
     dd if=/dev/zero of="$1" bs=1 count=0 seek="${imagesize}"
 }
 
+# NB! we want stdout appended to the manifest, yet stderr to be printed on stdout
 create_manifest() {
     local chroot_root=${1}
     local target_file=${2}
     echo "create_manifest chroot_root: ${chroot_root}"
     dpkg-query --show --admindir="${chroot_root}/var/lib/dpkg" > ${target_file}
     echo "create_manifest call to dpkg-query finished."
-    ./config/snap-seed-parse "${chroot_root}" >> ${target_file}
+    ./config/snap-seed-parse "${chroot_root}" 2>&1 >> ${target_file}
     echo "create_manifest call to snap_seed_parse finished."
     echo "create_manifest finished"
 }