8177632: ScheduledThreadPoolExecutor delayed task shutdown policy affects non-scheduled tasks 8176254: ScheduledThreadPoolExecutor periodic tasks not cancelled if running at shutdown 8173113: Javadoc for ThreadPoolExecutor is unclear wrt corePoolSize and running threads Reviewed-by: martin, psandoz, dholmes

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7062169: (coll) micro-optimize ArrayList.remove(Object) Reviewed-by: martin, psandoz, igerasim