tests/test-hgrc

Revert changeset c67920d78248.

It breaks 'hg merge && hg up -c REV' when files exist only in one of the
manifests, making hg throw a traceback like:

#!/bin/sh

mkdir t
cd t
hg init
echo "invalid" > .hg/hgrc
hg status 2>&1 |sed -e "s:/.*\(/t/.*\):...\1:"