image: Fix "metadata is not deterministic" when chaining 2+ CONVERSION_CMDs
When we have more than one CONVERSION_CMD being used, for example
ext4.gz.sha256sum we will see errors about "metadata is not
deterministic". This is because we do not have a stable order of
intermediate files that will be removed in the generated shell command.
We fix this by calling sorted() on the set of rm_tmp_images so that we
will have a stable hash again.
Cc: Patrick Ohly <patrick.ohly@intel.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
(cherry picked from commit
98a2afeb3a53bec7a72a4a9846e1dba636cc6f3d)
Signed-off-by: Armin Kuster <akuster808@gmail.com>
