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

Change-Id: I560808f4bf292063f9a5d6826b247520e5df3a04
diff --git a/roles/lxd-finish/tasks/main.yml b/roles/lxd-finish/tasks/main.yml
index 4c02bce..d3fa47b 100644
--- a/roles/lxd-finish/tasks/main.yml
+++ b/roles/lxd-finish/tasks/main.yml
@@ -25,6 +25,7 @@
     - skip_ansible_lint # running a sub job
 
 - name: Have containers use the apt-cache
+  when: use_apt_cache
   command: >
     ansible containers -b -u ubuntu
      -m lineinfile