subrepo: use hg.repository instead of creating localrepo directly
this way, extensions' reposetup will be called, which allows for git
subrepos to be handled by hg-git (and I believe the same goes for
svn and hgsubversion)
#!/bin/sh
"$TESTDIR/hghave" fifo || exit 80
hg init
mkfifo p
hg serve --stdio < p &
P=$!
(echo lock; echo addchangegroup; sleep 5) > p &
Q=$!
sleep 3
kill -HUP $P
wait
echo .hg/* .hg/store/*