fixed synchronizer error  "Waiting for data model to come up"
host is "xos_db", not "localhost"

Change-Id: Ic60e58b8bc0d8d5e70c8654325d98de269a3e545
diff --git a/xos/synchronizer/vbbu_config b/xos/synchronizer/vbbu_config
index 3713b67..f85ecb3 100644
--- a/xos/synchronizer/vbbu_config
+++ b/xos/synchronizer/vbbu_config
@@ -3,7 +3,7 @@
 name=xos
 user=postgres
 password=password
-host=localhost
+host=xos_db
 port=5432
 
 # Required by XOS