replay: keep buf original argument in hid_replay_event()

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
replay: fix case in interactive mode

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
replay: add sleep option

This option allows to sleep an amount of seconds once the device is
created. It is useful in conjunction with --one argument for running
tests.

Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>