[PATCH 03 of 10] chg: drop progress.assume-tty config

[Yuya Nishihara]

On Wed, 2 Mar 2016 10:44:05 +0000, Jun Wu wrote:
> # HG changeset patch
> # User Jun Wu <quark at fb.com>
> # Date 1456746205 0
> #      Mon Feb 29 11:43:25 2016 +0000
> # Node ID 855e65accbb4519f7140828efe6800b0b92fd5f4
> # Parent  74f9fd794398e5bebb6271cea53d5e5e5bf5e590
> chg: drop progress.assume-tty config
> 
> Since chgserver will just take over the fds passed from the client. It can
> pass istty check and progress.assume-tty is no longer necessary.

Updated the reasoning, dropped assume-tty from Makefile, and pushed to the
clowncopter, thanks.