add shebang lines to all lib files

With gerrit 2.8, and the new change screen, this will trigger syntax
highlighting in gerrit. Thus making reviewing code a lot nicer.

Change-Id: Id238748417ffab53e02d59413dba66f61e724383
diff --git a/lib/cinder_backends/xiv b/lib/cinder_backends/xiv
index ee5da2d..6eadaae 100644
--- a/lib/cinder_backends/xiv
+++ b/lib/cinder_backends/xiv
@@ -1,3 +1,5 @@
+#!/bin/bash
+#
 # Copyright 2014 IBM Corp.
 # Copyright (c) 2014 OpenStack Foundation
 # All Rights Reserved.
@@ -82,4 +84,3 @@
 # Local variables:
 # mode: shell-script
 # End:
-