policycoreutils: sandbox: use dbus-launch

Instead of directly calling, use dbus-launch.

Signed-off-by: Eric Paris <eparis@redhat.com>
Acked-by: Dan Walsh <dwalsh@redhat.com>
diff --git a/policycoreutils/sandbox/sandbox b/policycoreutils/sandbox/sandbox
index 35f2d48..ede0e44 100644
--- a/policycoreutils/sandbox/sandbox
+++ b/policycoreutils/sandbox/sandbox
@@ -237,7 +237,7 @@
 /usr/bin/test -r ~/.xmodmap && /usr/bin/xmodmap ~/.xmodmap
 %s &
 WM_PID=$!
-%s
+dbus-launch --exit-with-session %s
 kill -TERM $WM_PID  2> /dev/null
 """ % (command, wm, command))
            fd.close()