Adding feature to support lvm for ephemeral VMs

Change-Id: Ib4329027e23981cbba39c9c1c894adbbbea4c7c3
diff --git a/tests/pillar/compute_cluster.sls b/tests/pillar/compute_cluster.sls
index 2bcd9b4..b027101 100644
--- a/tests/pillar/compute_cluster.sls
+++ b/tests/pillar/compute_cluster.sls
@@ -70,3 +70,9 @@
     upgrade_levels:
       compute: liberty
     libvirt_service_group: libvirtd
+    lvm:
+      ephemeral: yes
+      images_volume_group: nova_vg
+      volume_clear: zero
+      volume_clear_size: 0
+