changed host to xos_db; resolves synchronizer no-start issue

Change-Id: I4dcfd00f70cea9af20b9bbe413a1397067ac9cbf
diff --git a/xos/synchronizer/vsgw_config b/xos/synchronizer/vsgw_config
index 58eaf9a..02d3fb0 100644
--- a/xos/synchronizer/vsgw_config
+++ b/xos/synchronizer/vsgw_config
@@ -3,7 +3,7 @@
 name=xos
 user=postgres
 password=password
-host=localhost
+host=xos_db
 port=5432
 
 # Required by XOS