Track db sync command time useage

We are trying to keep better track of what pieces of devstack consume
the most time. Add the db sync commands to the time tracking as they run
the database migrations which can take more time than expected.

Change-Id: Ib92f2b8304ccf703712d45fd7207444de3599e2d
diff --git a/lib/placement b/lib/placement
index ad12824..8adbbde 100644
--- a/lib/placement
+++ b/lib/placement
@@ -149,7 +149,9 @@
 function init_placement {
     if [ "$PLACEMENT_DB_ENABLED" != False ]; then
         recreate_database placement
+        time_start "dbsync"
         $NOVA_BIN_DIR/nova-manage --config-file $NOVA_CONF api_db sync
+        time_stop "dbsync"
     fi
     create_placement_accounts
 }