Fix minInterval option

The number option needs to be specified using add_option,
not add_flag.

Tested: with the fix, --min_interval=60000 sets the minInterval to 60
seconds.

Resolves: openbmc/phosphor-watchdog#2

Signed-off-by: Kun Yi <kunyi731@gmail.com>
Change-Id: I2b318454d13b5f7e607f9c9b9de1903edf7bc3a6
1 file changed