Seed the subiquity snap to track the stable channel (LP: #1724410)

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.478) UNRELEASED; urgency=medium
+
+  * Two last minute server-live fixes:
+    - Seed the subiquity snap to track the stable channel (LP: #1724410)
+
+ -- Michael Hudson-Doyle <mwhudson@debian.org>  Wed, 18 Oct 2017 13:22:50 +1300
+
 livecd-rootfs (2.477) artful; urgency=medium
 
   * Fix server live image to pull subiquity from the stable channel, not

live-build/ubuntu-server/hooks/032-installer-squashfs.binary

@@ -64,7 +64,7 @@ snaps:
    channel: stable
    file: ${CORE_SNAP}
  - name: subiquity
-   channel: edge
+   channel: stable
    classic: true
    file: ${SUBIQUITY_SNAP}
 EOF