Run glance-manage db_sync.

Updates stack.sh so that it runs glance-manage db_sync. This
should pave the way for us to default Glance DB auto-creation
to False in Glance.

Previously we would rely on glance-registry (and glance-api in Folsom)
to auto create the DB for us. I've found this to be a bit racey
so explicitly using glance-manage seems the way to go.

Change-Id: I61f165db6e0591e819d12aa2e2a4d336ad1172c3
diff --git a/stack.sh b/stack.sh
index 7faa8f6..e73d3e4 100755
--- a/stack.sh
+++ b/stack.sh
@@ -1037,6 +1037,9 @@
 
     GLANCE_POLICY_JSON=$GLANCE_CONF_DIR/policy.json
     cp $GLANCE_DIR/etc/policy.json $GLANCE_POLICY_JSON
+
+    $GLANCE_DIR/bin/glance-manage db_sync
+
 fi
 
 # Quantum (for controller or agent nodes)