[Bug 251540] [tcp] regression: no FIN on TCP connections when shutting down

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=251540

--- Comment #6 from commit-hook at FreeBSD.org ---
A commit references this bug:

Author: cy
Date: Fri Dec  4 19:31:16 UTC 2020
New revision: 368345
URL: https://svnweb.freebsd.org/changeset/base/368345

Log:
  Revert r366857.

  r366857 created a number of problems, tearing down interfaces too
  early in shutdown. This resulted in:

  - hung ssh sessions when shutting down or rebooting remotely using
    shutdown (I've used exec shutdown, for years, as apposed to simply
    shutdown).

  - NFS mounted filesystems "disappear" prior to unmount.

  - dhclient attached to a VLAN on an interface who's parent interface
    has already shut down prints errors.

  The path forward is to teach lagg(4) and vlan(4) about WOL.

  PR:           251531, 251540
  PR:           158734, 109980 are broken again
  Reported by:  jhb, emaste, jtl, Helge Oldach<freebsd_oldach.net>
                Martin Birgmeier <d8zNeCFG_aon.at>
  MFC after:      Immediately
  Discussion at:        https://reviews.freebsd.org/D27459

Changes:
  head/libexec/rc/rc.d/netif

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