Synthetic Packages do not get Published correctly and need to be published during image build

[Toasterson]

In build_disk.sh we have the following todo.

# for reasons I can't fathom, synthetic packages don't get published right now
pkgsend publish -s illumos-gate/packages/aarch64/nightly/repo.redist \
    illumos-gate/usr/src/pkg/packages.aarch64/osnet-incorporation.mog
pkgsend publish -s illumos-gate/packages/aarch64/nightly/repo.redist \
    illumos-gate/usr/src/pkg/packages.aarch64/osnet-redist.mog