FIX in devstack IMAGE_URLS for ceilometer custom image
diff --git a/xos/configurations/common/devstack/local.conf b/xos/configurations/common/devstack/local.conf
index 6e4d4cb..632ed1b 100644
--- a/xos/configurations/common/devstack/local.conf
+++ b/xos/configurations/common/devstack/local.conf
@@ -2,7 +2,7 @@
 [[local|localrc]]
 
 DOWNLOAD_DEFAULT_IMAGES=false
-IMAGE_URLS="http://www.planet-lab.org/cord/trusty-server-multi-nic.img"
+IMAGE_URLS="http://www.planet-lab.org/cord/trusty-server-multi-nic.img,"
 IMAGE_URLS+="http://www.vicci.org/cord/ceilometer-trusty-server-multi-nic.qcow2"
 LIBVIRT_FIREWALL_DRIVER=nova.virt.firewall.NoopFirewallDriver
 # Append the git branch name if you wish to download ceilometer from a specific branch