initctl: Make sure to open fifo with CLOEXEC
initctl: Make sure to open fifo with CLOEXEC

With O_CLOEXEC we prevent forked+exec'ed children from accessing the
initctl fifo via that socket.

Signed-off-by: Joachim Nilsson <583c295fd7602c168ad814279bbc3894ba65f5d6@gmail.com>

troglobit/finit,westermo/finit,troglobit/finit,westermo/finit