[OE-core] Chaining compression support fixes for morty / pyro

[Tom Rini]

Hi Armin,

The following changes in master are relevant to both morty and pyro:

commit 0a7ce0b971a208956cb895ba5a869ec8c5d94703
Author: Tom Rini <trini at konsulko.com>
Date:   Fri Jul 21 18:06:33 2017 -0400

    image.bbclass: Correct chaining compression support

commit 98a2afeb3a53bec7a72a4a9846e1dba636cc6f3d
Author: Tom Rini <trini at konsulko.com>
Date:   Tue Jul 25 15:58:09 2017 -0400

    image: Fix "metadata is not deterministic" when chaining 2+ CONVERSION_CMDs

And fix the problem where you cannot make arbitrary combinations of say
"ext4", "u-boot" and "xz" images.  In the interest of full disclosure,
it is entirely possible that there are image types introduces in other
layers that have the same problem that the "u-boot" type had which lead
to 46bc438374de being done in the first place, which is to say a new
IMAGE_CMD that also cleaned up the intermediate files on its own.  This
may make this too risky to pull into stable branches and that's fine.
Thanks for your consideration!

-- 
Tom
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