add(build-494): Add manifest for v494.2.0

Change-Id: I4cc659336f251354a7ebb2e66e75e6905515c54a
add(build-494): Add manifest for v494.3.0

Change-Id: I7486829483145ed5f749ae6550f0721a3b47e88b
Change coreos/coreos-overlay to higebu/coreos-overlay and coreos/scripts to higebu/scripts