[PATCH 1 of 8 ipv6] runtests: export HGIPV6 to hint test scripts whether to use IPv6

[Danek Duvall]

Jun Wu wrote:

> # HG changeset patch
> # User Jun Wu <quark at fb.com>
> # Date 1487221422 28800
> #      Wed Feb 15 21:03:42 2017 -0800
> # Node ID f2743873dfbd6adedcd3aa1777b651ce5bd6f6ed
> # Parent  a70e11929c63cd9245812f3db8091a449cd1273e
> # Available At https://bitbucket.org/quark-zju/hg-draft
> #              hg pull https://bitbucket.org/quark-zju/hg-draft -r f2743873dfbd
> runtests: export HGIPV6 to hint test scripts whether to use IPv6
> 
> Previously, run-tests.py only exports HGPORT, and scripts in tests do not
> know if IPv6 should be used. And that breaks scripts like dumbhttp.py which
> always uses IPv4.
> 
> This patch makes run-tests.py export HGIPV6, which can help test scripts
> like dumbhttp.py and tinyproxy.py to decide whether to use IPv6 or not.

So does this set of patches mean that if IPv6 is available on the test
machine, IPv4 won't be tested at all?

Thanks,
Danek