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/neutron b/lib/neutron
index 5c88a50..2a660ec 100644
--- a/lib/neutron
+++ b/lib/neutron
@@ -336,8 +336,10 @@
 
     recreate_database neutron
 
+    time_start "dbsync"
     # Run Neutron db migrations
     $NEUTRON_BIN_DIR/neutron-db-manage upgrade heads
+    time_stop "dbsync"
 
     create_neutron_cache_dir
 }