Because 'ipfw flush' is such a dangerous command (given that most

firewalls are remote, and this command will kill the network connection
to them), prompt the user for confirmation of this command.

Also, add the '-f' flag which ignores the need for confirmation the
command, and if there is no controlling tty (isatty(STDIN_FILENO) !=0)
assume '-f'.

If anyone is using ipfw flush in scripts it shouldn't affect them, but you
may want to change the script to use a 'ipfw -f flush'.

Reviewed by:	alex

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