In tail input, on 'Exit_On_EOF' case, call flb_engine_exit()
In tail input, on 'Exit_On_EOF' case, call flb_engine_exit()

Formerly this was calling flb_engine_shutdown(), which had the
affect of not flushing/calling through the grace period.

Signed-off-by: Don Bowman <1f1e67e5fdb25d2e5cd18ddc0fee425272daab56@agilicus.com>

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