For config hash, we put the keys in structure of "set()", which is not
order sensitive. Therefore when calculating the md5 value for config
hash, we need to identify the order of the keys.
(Bitbake rev: 0f1b142a3f6b8125bf023c2e5ec269618869abf7)
Signed-off-by: Dongxiao Xu <dongxiao.xu@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>