Import patches-unapplied version 2.475 to ubuntu/artful-proposed

Imported using git-ubuntu import.

Changelog parent: 00b23f0f6b

New changelog entries:
  * Add the SNAP_REEXEC=0 enviroment to the subiquity service as well.

debian/changelog

@@ -1,3 +1,9 @@
+livecd-rootfs (2.475) artful; urgency=medium
+
+  * Add the SNAP_REEXEC=0 enviroment to the subiquity service as well.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Thu, 12 Oct 2017 00:32:46 -0400
+
 livecd-rootfs (2.474) artful; urgency=medium
 
   * Fix wrong variable name in systemd unit snippets.

live-build/ubuntu-server/includes.binary/overlay/lib/systemd/system/subiquity.service

@@ -9,6 +9,7 @@ ConditionPathExists=!/run/subiquity/complete
 
 [Service]
 Environment=PYTHONPATH=/usr/share/subiquity
+Environment=SNAP_REEXEC=0
 ExecStartPre=/bin/systemctl stop getty@tty1
 ExecStartPre=/bin/dmesg -n 1
 ExecStartPre=/snap/bin/subiquity.subiquity-loadkeys