Purge 4.2BSD TCP tasks in FIN_WAIT_2

[jbn at wdl1.UUCP]

      The timeout in FINWAIT2 does violate the TCP spec, but unless you use
some applications that like to close one side of a connection while using
the other for a long period thereafter, it shoudn't hurt.  Since UNIX lacks
an asymmetrical close, this is not much of a problem between UNIX sites.
      It is a known bug that most TOPS-20 systems don't perform the TCP
close handshake properly.  We first noticed this problem several years ago,
and it still hasn't been fixed everywhere; the machines at BBN are OK, but
expect some minor problems from TOPS-20 sites that got the code via DEC.
      On to TP-4.

						John Nagle