[sysadmin-bin] post-receive-notify-ostree: fix missing import

[Owen Taylor <otaylor src gnome org>]

commit a16528adcaca4a592a4e6e9f74fb6f4f390e1af1
Author: Owen W. Taylor <otaylor fishsoup net>
Date:   Tue Oct 9 01:41:47 2012 -0400

    post-receive-notify-ostree: fix missing import

 git/post-receive-notify-ostree |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)
---
diff --git a/git/post-receive-notify-ostree b/git/post-receive-notify-ostree
index 868b102..9192762 100755
--- a/git/post-receive-notify-ostree
+++ b/git/post-receive-notify-ostree
@@ -24,6 +24,7 @@
 # This script is simply sends a poke to a fishpoll target on
 # ostree.gnome.org
 
+import os
 from subprocess import Popen
 import sys