I am sorry that use os.tmpname which casue a security warning.
Follow Darren's suggestion to use tempfile.NamedTemporaryFile instead.
(Bitbake rev: fe514a130579302312f68821536d108c8ceb4363)
Signed-off-by: Kang Kai <kai.kang@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>