rhg: Add support for ui.ignore and ui.ignore.* config
This fixes some but not all failures in `tests/test-hgignore.t` when running
with `rhg status` enabled.
Differential Revision: https://phab.mercurial-scm.org/D11907
mkcommit() {
name="$1"
shift
echo "$name" > "$name"
hg add "$name"
hg ci -m "$name" "$@"
}