please unblock nufw 2.2.15-2

[Pierre Chifflier <p.chifflier@inl.fr>]

Hi,

Please include nufw 2.2.15-2 into lenny, it fixes a RC bug which is tagged
security (rpath to insecure location).

Changelog:
   * Remove rpath to insecure location (Closes: #495769)
   * urgency=high because of RC bug
   * Add dependency on rpath
   * Bump standards version (no changes)

Thanks,
Pierre