Import patches-unapplied version 2.527 to ubuntu/cosmic-proposed

Imported using git-ubuntu import.

Changelog parent: a4e3e38884

New changelog entries:
  * Symlink systemd-networkd-wait-online to /bin/true in the live installer
    live session to avoid depending on buggy systemd behaviour.
  * Remove "optional: true" from installer netplan config.

debian/changelog

@@ -1,3 +1,11 @@
+livecd-rootfs (2.527) cosmic; urgency=medium
+
+  * Symlink systemd-networkd-wait-online to /bin/true in the live installer
+    live session to avoid depending on buggy systemd behaviour.
+  * Remove "optional: true" from installer netplan config.
+
+ -- Michael Hudson-Doyle <michael.hudson@ubuntu.com>  Wed, 23 May 2018 14:27:01 +1200
+
 livecd-rootfs (2.526) cosmic; urgency=medium
 
   * Drop Lubuntu Next now that Lubuntu Next is Lubuntu.

live-build/ubuntu-server/includes.binary/overlay/etc/netplan/00-installer-config.yaml

@@ -7,9 +7,7 @@ network:
             match:
                 name: "en*"
             dhcp4: true
-            optional: true
         all-eth:
             match:
                 name: "eth*"
             dhcp4: true
-            optional: true

live-build/ubuntu-server/includes.binary/overlay/lib/systemd/systemd-networkd-wait-online

@@ -0,0 +1 @@
+/bin/true