Use the oslo db database connection for Heat

This is the preferred configuration now, and sql_connection is
deprecated.

Change-Id: I2d8342b5025ab481e1db0521a3e0610b73bda9de
diff --git a/lib/heat b/lib/heat
index 8f123ea..7a9ef0d 100644
--- a/lib/heat
+++ b/lib/heat
@@ -80,7 +80,7 @@
     iniset $HEAT_CONF DEFAULT heat_metadata_server_url http://$HEAT_API_CFN_HOST:$HEAT_API_CFN_PORT
     iniset $HEAT_CONF DEFAULT heat_waitcondition_server_url http://$HEAT_API_CFN_HOST:$HEAT_API_CFN_PORT/v1/waitcondition
     iniset $HEAT_CONF DEFAULT heat_watch_server_url http://$HEAT_API_CW_HOST:$HEAT_API_CW_PORT
-    iniset $HEAT_CONF DEFAULT sql_connection `database_connection_url heat`
+    iniset $HEAT_CONF database connection `database_connection_url heat`
     iniset $HEAT_CONF DEFAULT auth_encryption_key `hexdump -n 16 -v -e '/1 "%02x"' /dev/random`
 
     # logging