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Add kevent EVFILT_EMPTY for notification when a client has received all data

Description

Add kevent EVFILT_EMPTY for notification when a client has received all data
i.e. everything outstanding has been acked.

Reviewed by: bz, gnn (previous version)
MFC after: 3 days
Sponsored by: Limelight Networks
Differential Revision: https://reviews.freebsd.org/D9150

Details