tcp_send: avoid ip fragmentation of last segment of a tcp stream

With a LSO (large segment offload) capable network device, tcp data is
sent in segments larger than mss. This works well normally and

tcp_send: avoid ip fragmentation of last segment of a tcp stream

With a LSO (large segment offload) capable network device, tcp data is
sent in segments larger than mss. This works well normally and the
network card splits the large segments into smaller ip packages not
exceeding the mss.

The last segment of a stream, when fin flag is already set, takes a
different code path (tcp_xmit_mp()). LSO is not possible here and not
supported. If the segment is large (> mss) in this case, it is
ip fragmented. This is not wanted.

The fix is to ensure the last segment of a tcp stream is below mss
even in case of LSO.

(cherry picked from commit 72434ca23766cfa425b040bac615a51f16341693)

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11849 listen of IPv6 address fails with EAFNOSUPPORT
Reviewed by: Garrett D'Amore <gdamore@racktopsystems.com>
Reviewed by: Dan McDonald <danmcd@joyent.com>
Reviewed by: Toomas Soome <tsoome@me.com>

11849 listen of IPv6 address fails with EAFNOSUPPORT
Reviewed by: Garrett D'Amore <gdamore@racktopsystems.com>
Reviewed by: Dan McDonald <danmcd@joyent.com>
Reviewed by: Toomas Soome <tsoome@me.com>
Approved by: Gordon Ross <gordon.w.ross@gmail.com>

(cherry picked from commit 90a795eee5cbec87ea2c0c8169dc62643635ca7e)

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5850 tcp timestamping behavior changed mid-connection
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Sebastien Roy <sebastien.roy@delphix.com

5850 tcp timestamping behavior changed mid-connection
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Robert Mustacchi <rm@joyent.com>
Reviewed by: Sebastien Roy <sebastien.roy@delphix.com>
Approved by: Richard Lowe <richlowe@richlowe.net>

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