fix host inventory example

fixed incorrect example in host_inventory file,  resolves issue 618

Signed-off-by: John Lockman <jlockman3@gmail.com>

examples/host_inventory_file

@@ -11,6 +11,6 @@ all:
         login1.omnia.local:
     compute:
       hosts:
-        compute[001-004].omnia.local:
+        compute[001:004].omnia.local:
         compute010.omnia.local:
         compute011.omnia.local: