change db from localhost to xos_db

Change-Id: I2a1dfda9d162e9072b10c6b6fe2c91b1ad21b564
diff --git a/xos/synchronizer/fabric_synchronizer_config b/xos/synchronizer/fabric_synchronizer_config
index 2ed56fe..e98abe5 100644
--- a/xos/synchronizer/fabric_synchronizer_config
+++ b/xos/synchronizer/fabric_synchronizer_config
@@ -3,7 +3,7 @@
 name=xos
 user=postgres
 password=password
-host=localhost
+host=xos_db
 port=5432
 
 # Required by XOS