classes/populate_sdk_ext: prevent image construction from executing on install

In order to prepare the build system within the extensible SDK, we
actually go ahead and build the targets specified by SDK_TARGETS (by
default the image the SDK was built for). Assuming that's an image, we
don't actually need to build the image itself - we just need to have
everything done up to the point before building the image, so that we
have everything needed in the sysroot.

In order to do this, create temporary bbappends for each of the targets
in the workspace layer that stub out do_rootfs and related tasks if they
exist. This is a little bit of a hack but is the least intrusive fix at
this point. To make things a bit tidier, I have split out the
preparation commands into a separate script so we can run that in the
appropriate environment rather than all the commands separately.

Fixes [YOCTO #7590].

Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

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