inventory: add missing module imports

Change-Id: I9df7e3917c3107356b67d2f59301a8bd42f59cc1
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>
diff --git a/pyinventorymgr/inventory_items.py b/pyinventorymgr/inventory_items.py
index 41e3093..456c2f3 100644
--- a/pyinventorymgr/inventory_items.py
+++ b/pyinventorymgr/inventory_items.py
@@ -1,5 +1,7 @@
 #!/usr/bin/env python
 
+import os
+import sys
 import gobject
 import dbus
 import dbus.service