Cleanup Vagrant VMs before molecule and vagrant CI (#6009)

tests/scripts/vagrant_clean.sh

@@ -0,0 +1,10 @@
+#!/bin/bash
+set -euxo pipefail
+
+# Cleanup vagrant VMs to avoid name conflicts
+
+for i in $(virsh list --name)
+do
+    virsh destroy "$i"
+    virsh undefine "$i"
+done