mount --move in fedora 18

[Norman Gaywood]

When using fedora and ltspfs, ltsp clients want to fuse mount their USB
drives onto the system into the /media directory. This mostly works except
for the last step of move mounting into the /media.

The part that fails is the equivalent of the last line in these steps:

mkdir -p /tmp/testing
 cd /tmp/testing/
 mkdir -p foo bar
 mount -t tmpfs tmpfs foo/
 mount --move foo bar/

The last step will give the error:

mount: wrong fs type, bad option, bad superblock on /tmp/testing/foo,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail or so

This worked (the mount --move) in Fedora 16 (without sandbox installed) and
Fedora 17. But not in fedora 18.

When the bug appeared briefly in F16, this bug:

https://bugzilla.redhat.com/show_bug.cgi?id=838447

was logged. As noted there removing sandbox fixed the problem.

F18 seems to make use of pam_sandbox which is probably want is stopping the
mount --move this time.

So how do I configure/remove pam_sandbox so the mounts will work again?