Delay starting the threadpool until necessary,
and once started, always exit with _exit().
Bug: 77934844
Test: screen is blanked on reboot
Change-Id: I7715d889a6f78b9ce058fb3841ef7944116d8e82
This is used to make the phone appear off by init
during late boot (e.x. fsck for disk health), so
it should shut off all lights (not just the screen).
Bug: 74976325
Test: blank_screen
Change-Id: I790cc3dd856c2c2095fa3cf82519fd30834304ca
This can be transitioned to by init to shutdown the
screen thereby preventing init from either depending
on binder or accessing halified sysnodes directly.
Bug: 70846424
Test: manual + init use
Change-Id: I86893ee5d7118547cd073297c0626e474f366b82
