[CORD-2463]
Make box used by Vagrant VM's a parameter

Change-Id: I19437de9126146a4e102b6db3288e6ae73b1354a
diff --git a/scenarios/single/Vagrantfile b/scenarios/single/Vagrantfile
index a1c07cd..b8e0d1f 100644
--- a/scenarios/single/Vagrantfile
+++ b/scenarios/single/Vagrantfile
@@ -8,7 +8,7 @@
 
 Vagrant.configure("2") do |config|
 
-  config.vm.box = "ubuntu/trusty64"
+  config.vm.box = settings["vagrant_box"]
 
   # sync these folders with VM
   config.vm.synced_folder "../../../", "/opt/cord/", create: true