Tweak tasks/stretch/Debian-xfce

Force some important packages up the dependency order so they're
guaranteed to fit (firefox, network-manager-gnome, synaptic)

debian/changelog

@@ -1,5 +1,10 @@
 debian-cd (3.1.21) UNRELEASED; urgency=medium
 
+  [ Steve McIntyre ]
+  * Tweak tasks/stretch/Debian-xfce: force some important packages up the
+    dependency order so they're guaranteed to fit (firefox,
+    network-manager-gnome, synaptic)
+
  -- Steve McIntyre <93sam@debian.org>  Tue, 06 Jun 2017 13:12:21 +0100
 
 debian-cd (3.1.20) unstable; urgency=medium

tasks/stretch/Debian-xfce

@@ -8,6 +8,12 @@
 /* Packages that should really be on CD1 */
 #include <debian-installer+kernel>
 #include <forcd1>
+
+/* Force some important packages up the dependency order */
+network-manager-gnome
+synaptic
+firefox-esr
+
 #include <task-essential-xfce>
 
 /* Other interesting packages */