add(build-493): Add manifest for v493.0.0

Change-Id: I5afe79c001a463658708e09684aea80d2e84fe66
add(build-494): Add manifest for v494.0.0

Change-Id: I7a268bdb40a62d740039330ed7684ab308d43331
add(build-502): Add manifest for v502.0.0

Change-Id: Id09a31793783f55fcbc7c2e8c8b9c623a694158f
Change coreos/coreos-overlay to higebu/coreos-overlay and coreos/scripts to higebu/scripts