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/template b/lib/template
index f77409b..2703788 100644
--- a/lib/template
+++ b/lib/template
@@ -1,3 +1,5 @@
+#!/bin/bash
+#
 # lib/template
 # Functions to control the configuration and operation of the XXXX service
 # <do not include this template file in ``stack.sh``!>