[Bug 207261] NETMAP don't do TX sync with kqueue

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=207261

            Bug ID: 207261
           Summary: NETMAP don't do TX sync with kqueue
           Product: Base System
           Version: 10.2-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: slw at zxy.spb.ru
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

NETMAP with kevent don't do TX sync w/o next hack:

1. first register event EVFILT_WRITE with EV_DISABLE
2. second, after update tx ring, add event EVFILT_WRITE with EV_DISPATCH

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