Implementing sftp server-side timeout

[Dmitry Belyavskiy]

Dear colleagues,

Currently there is no way for the sftp backend (sftp-server or
internal-sftp) to close idle connections (by idle I mean no order sent for
some time by the sftp client).

My colleague has proposed a patch to deal with it in
https://bugzilla.mindrot.org/show_bug.cgi?id=3484

It looks like a reasonable feature and I kindly ask to evaluate this and
include it into an upcoming OpenSSH release.

Many thanks in advance!

-- 
Dmitry Belyavskiy