Make sure to cleanup swift on unstack/relaunch.

- Fixes bug 1049553.

Change-Id: I9fef93d25512c014dfb882adf0e169487bf877d8
diff --git a/unstack.sh b/unstack.sh
index 1d4bfd5..a086d5c 100755
--- a/unstack.sh
+++ b/unstack.sh
@@ -65,6 +65,7 @@
 # Swift runs daemons
 if is_service_enabled swift; then
     stop_swift
+    cleanup_swift
 fi
 
 # Apache has the WSGI processes