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

Change-Id: I19437de9126146a4e102b6db3288e6ae73b1354a
diff --git a/scenarios/mock/Vagrantfile b/scenarios/mock/Vagrantfile
index 1b39bf9..4fa4b65 100644
--- a/scenarios/mock/Vagrantfile
+++ b/scenarios/mock/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
diff --git a/scenarios/mock/config.yml b/scenarios/mock/config.yml
index 1574390..d80f177 100644
--- a/scenarios/mock/config.yml
+++ b/scenarios/mock/config.yml
@@ -23,6 +23,7 @@
 build_cord_dir: /opt/cord
 
 # Vagrant VM configuration
+vagrant_box: "ubuntu/trusty64"
 head_vm_mem: 2048
 head_vm_cpu: 1
 head_vm_ip: "192.168.46.100"