provide 66 {poweroff,reboot,halt,wall} command

package/deps.mak

package/modes

skel/halt

skel/poweroff

skel/rc.init

skel/rc.init.container

skel/rc.shutdown

skel/reboot

skel/shutdown

src/66/66-hpr.c

src/66/66-shutdown.c

src/66/66.c

src/include/66/ssexec.h

src/lib66/exec/deps-lib/deps

src/lib66/exec/ssexec_help.c

src/lib66/exec/ssexec_shutdown_wrapper.c