Add Debian OS support in DevStack

Fix bug #1176216

Change-Id: Ia94c332f02a921a936db249dc3b4a7ae4eff0400
diff --git a/lib/ceilometer b/lib/ceilometer
index 6b110cb..1c289fd 100644
--- a/lib/ceilometer
+++ b/lib/ceilometer
@@ -125,7 +125,7 @@
 
 # start_ceilometer() - Start running processes, including screen
 function start_ceilometer() {
-    screen_it ceilometer-acompute "cd $CEILOMETER_DIR && sg libvirtd \"$CEILOMETER_BIN_DIR/ceilometer-agent-compute --config-file $CEILOMETER_CONF\""
+    screen_it ceilometer-acompute "cd $CEILOMETER_DIR && sg $LIBVIRT_GROUP \"$CEILOMETER_BIN_DIR/ceilometer-agent-compute --config-file $CEILOMETER_CONF\""
     screen_it ceilometer-acentral "cd $CEILOMETER_DIR && $CEILOMETER_BIN_DIR/ceilometer-agent-central --config-file $CEILOMETER_CONF"
     screen_it ceilometer-collector "cd $CEILOMETER_DIR && $CEILOMETER_BIN_DIR/ceilometer-collector --config-file $CEILOMETER_CONF"
     screen_it ceilometer-api "cd $CEILOMETER_DIR && $CEILOMETER_BIN_DIR/ceilometer-api -d -v --log-dir=$CEILOMETER_API_LOG_DIR --config-file $CEILOMETER_CONF"