[CORD-1145]
Option to enable apt-cache, conform feature toggles

Change-Id: I560808f4bf292063f9a5d6826b247520e5df3a04
diff --git a/roles/lxd-finish/defaults/main.yml b/roles/lxd-finish/defaults/main.yml
index 0f65371..619335d 100644
--- a/roles/lxd-finish/defaults/main.yml
+++ b/roles/lxd-finish/defaults/main.yml
@@ -1,6 +1,8 @@
 ---
 # lxd-finish/defaults/main.yml
 
+use_apt_cache: True
+
 apt_cacher_name: apt-cache
 
 run_dist_upgrade: False