[PATCH 08 of 13 V3] run-tests: drop environment variables affecting configs

[Jun Wu]

# HG changeset patch
# User Jun Wu <quark at fb.com>
# Date 1489455061 25200
#      Mon Mar 13 18:31:01 2017 -0700
# Node ID c537d04829a8dc0b88fe03ec41e95a85638c696b
# Parent  d604e5baed4ac2f5470860bff89728c282d71e3a
# Available At https://bitbucket.org/quark-zju/hg-draft
#              hg pull https://bitbucket.org/quark-zju/hg-draft -r c537d04829a8
run-tests: drop environment variables affecting configs

Those environment variables can affect future tests. Drop them so tests run
reliably.

diff --git a/tests/run-tests.py b/tests/run-tests.py
--- a/tests/run-tests.py
+++ b/tests/run-tests.py
@@ -908,4 +908,5 @@ class Test(unittest.TestCase):
         for k in ('HG HGPROF CDPATH GREP_OPTIONS http_proxy no_proxy ' +
                   'HGPLAIN HGPLAINEXCEPT ' +
+                  'EDITOR VISUAL PAGER ' +
                   'NO_PROXY CHGDEBUG').split():
             if k in env: