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

Change-Id: I19437de9126146a4e102b6db3288e6ae73b1354a
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"