Revert "dtrace disassembler: take the latest/last CDDL code from OpenSolaris"

This reverts commit 2bc0799cbc4f51bcf80c83d6bc60a6865a7d64d2.
Fix a typo (set-e)

Convert all set -e's to && compounded commands because sjg has a
fascination with && as opposed to using set -e
Revert "Have to default to boot -h"

This reverts commit 8c762b4cef8cb70b7470711532f5e568c46b17fa.
Revert "Set the console to use both serial and VGA consoles"

This reverts commit 7fb9c593bf756f5848facd3e2c014eff5d06cc27.