Import patches-unapplied version 2.476 to ubuntu/artful-proposed

Imported using git-ubuntu import.

Changelog parent: 979261d927

New changelog entries:
  * snap.subiquity.started.service must be RemainAfterExit=yes to satisfy
    the service dependencies.

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.476) artful; urgency=medium
+
+  * snap.subiquity.started.service must be RemainAfterExit=yes to satisfy
+    the service dependencies.
+
+ -- Steve Langasek <steve.langasek@ubuntu.com>  Thu, 12 Oct 2017 09:23:52 -0400
+
 livecd-rootfs (2.475) artful; urgency=medium
 
   * Add the SNAP_REEXEC=0 enviroment to the subiquity service as well.

live-build/ubuntu-server/includes.binary/overlay/etc/systemd/system/snap.subiquity.started.service.d/no-reexec.conf

@@ -1,2 +1,3 @@
 [Service]
+RemainAfterExit=yes
 Environment=SNAP_REEXEC=0