Cleanup virsh volumes in Vagrant CI (#6688)

tests/scripts/vagrant_clean.sh

@@ -10,3 +10,10 @@ do
     virsh destroy "$i"
     virsh undefine "$i"
 done
+
+
+# Cleanup domain volumes
+for i in $(virsh vol-list default|grep \.img |grep -v VAGRANTSLASH | cut -f 2 -d ' ')
+do
+    virsh vol-delete "$i" --pool default
+done