Make kevents on pipes work as described in the manpage - when the last reader/writer disconnects, ensure that anybody who is waiting for the kevent on the other end of the pipe gets EV_EOF.
Make kevents on pipes work as described in the manpage - when the last
reader/writer disconnects, ensure that anybody who is waiting for the
kevent on the other end of the pipe gets EV_EOF.

MFC after:	2 weeks

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