Add support for connected INET sockets

[Oren Laadan]

Great !  will add to v19-rc2.

Oren.

Dan Smith wrote:
> This is an update of the previous set to apply on top of v19-rc1 and to
> address some of the trivial changes suggested on list.  Those are detailed
> per-patch.  I will follow up with a patch to change ckpt_debug to ckpt_err
> where appropriate, across the whole net/*/checkpoint.c set.  Since this
> will apply to the unchanged gso patch as well, I decided to do this as a
> follow-on cleanup patch.
> 
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