change db from localhost to xos_db

Change-Id: I3418710d6038b7586eb3f08c59466f552ce8c04d
diff --git a/xos/synchronizer/vrouter_config b/xos/synchronizer/vrouter_config
index 2af1700..f01bd79 100644
--- a/xos/synchronizer/vrouter_config
+++ b/xos/synchronizer/vrouter_config
@@ -3,7 +3,7 @@
 name=xos
 user=postgres
 password=password
-host=localhost
+host=xos_db
 port=5432
  
 # Required by XOS