contrib: add kas variant of build_imgs_package.sh
contrib: add kas variant of build_imgs_package.sh

Add a variant of build_imgs_package.sh that uses kas under the hood.

Signed-off-by: Michael Auchter <a2d0d096b897822cbebc630274248e0fc0a5354d@ni.com>

EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus,EttusResearch/meta-ettus