Don't kill ceilometer prematurally in devstackgate

This change ensure that 'ceilometer' processes are not killed
by stack.sh when USE_SCREEN=False

Fixes bug #1234254

Change-Id: I48dbf18ea0b169cdb5295a709d82c025f6fb8930
diff --git a/lib/ceilometer b/lib/ceilometer
index 1b04319..cd4c4d8 100644
--- a/lib/ceilometer
+++ b/lib/ceilometer
@@ -134,12 +134,12 @@
 
 # start_ceilometer() - Start running processes, including screen
 function start_ceilometer() {
-    screen_it ceilometer-acompute "sg $LIBVIRT_GROUP \"ceilometer-agent-compute --config-file $CEILOMETER_CONF\""
-    screen_it ceilometer-acentral "ceilometer-agent-central --config-file $CEILOMETER_CONF"
-    screen_it ceilometer-collector "ceilometer-collector --config-file $CEILOMETER_CONF"
-    screen_it ceilometer-api "ceilometer-api -d -v --log-dir=$CEILOMETER_API_LOG_DIR --config-file $CEILOMETER_CONF"
-    screen_it ceilometer-alarm-notifier "ceilometer-alarm-notifier --config-file $CEILOMETER_CONF"
-    screen_it ceilometer-alarm-evaluator "ceilometer-alarm-evaluator --config-file $CEILOMETER_CONF"
+    screen_it ceilometer-acompute "cd ; sg $LIBVIRT_GROUP \"ceilometer-agent-compute --config-file $CEILOMETER_CONF\""
+    screen_it ceilometer-acentral "cd ; ceilometer-agent-central --config-file $CEILOMETER_CONF"
+    screen_it ceilometer-collector "cd ; ceilometer-collector --config-file $CEILOMETER_CONF"
+    screen_it ceilometer-api "cd ; ceilometer-api -d -v --log-dir=$CEILOMETER_API_LOG_DIR --config-file $CEILOMETER_CONF"
+    screen_it ceilometer-alarm-notifier "cd ; ceilometer-alarm-notifier --config-file $CEILOMETER_CONF"
+    screen_it ceilometer-alarm-evaluator "cd ; ceilometer-alarm-evaluator --config-file $CEILOMETER_CONF"
 }
 
 # stop_ceilometer() - Stop running processes