Revert "rc: implement parallel boot"
This is not ready yet for prime time
This reverts commit 763db58932874bb47fc6f9322ab81cc947f80991.
This reverts commit f1ab799927c8e93e8f58e5039f287a2ca45675ec.
This reverts commit 6e822e99570fdf4c564be04840a054bccc070222.
This reverts commit 77e1ccbee3ed6c837929e4e232fd07f95bfc8294.