switch to use ceilometer specific connections

in Juno/Kilo, we added ceilometer purpose specific connections for:
metering, alarms, event. Rather than piggyback off oslo.db's
connection option (which gives misleading sql help message), we
should use Ceilometer specific connections.

Change-Id: I7703b73708a5807fb8de89fbb828f06b488acf69

Author: chungg

lib/ceilometer

@@ -183,10 +183,14 @@ function configure_ceilometer {
     configure_auth_token_middleware $CEILOMETER_CONF ceilometer $CEILOMETER_AUTH_CACHE_DIR
 
     if [ "$CEILOMETER_BACKEND" = 'mysql' ] || [ "$CEILOMETER_BACKEND" = 'postgresql' ] ; then
-        iniset $CEILOMETER_CONF database connection $(database_connection_url ceilometer)
+        iniset $CEILOMETER_CONF database alarm_connection $(database_connection_url ceilometer)
+        iniset $CEILOMETER_CONF database event_connection $(database_connection_url ceilometer)
+        iniset $CEILOMETER_CONF database metering_connection $(database_connection_url ceilometer)
         iniset $CEILOMETER_CONF DEFAULT collector_workers $API_WORKERS
     else
-        iniset $CEILOMETER_CONF database connection mongodb://localhost:27017/ceilometer
+        iniset $CEILOMETER_CONF database alarm_connection mongodb://localhost:27017/ceilometer
+        iniset $CEILOMETER_CONF database event_connection mongodb://localhost:27017/ceilometer
+        iniset $CEILOMETER_CONF database metering_connection mongodb://localhost:27017/ceilometer
         configure_mongodb
         cleanup_ceilometer
     fi