tests/test-hup

fix bash completion of debug commands; add test for debugcomplete

The debugconfig -> showconfig renaming broke things.

#!/bin/sh

hg init
mkfifo p

hg serve --stdio < p &
P=$!
(echo lock; echo addchangegroup; sleep 5) > p &
Q=$!
sleep 3
kill -HUP $P
wait
ls .hg