tests: use 'do sleep 0' instead of 'do true', also on first line of command
f64b25f147d7 established that '... do true ...' shouldn't be used, but that was
only enforced on continued lines.
$ "$TESTDIR/hghave" serve || exit 80
$ hg clone http://localhost:$HGPORT/ copy
abort: error: Connection refused
[255]
$ test -d copy
[1]
$ cat > dumb.py <<EOF
> import BaseHTTPServer, SimpleHTTPServer, os, signal
> def run(server_class=BaseHTTPServer.HTTPServer,
> handler_class=SimpleHTTPServer.SimpleHTTPRequestHandler):
> server_address = ('localhost', int(os.environ['HGPORT']))
> httpd = server_class(server_address, handler_class)
> open("listening", "w")
> httpd.handle_request()
> run()
> EOF
$ python dumb.py 2> log &
$ P=$!
$ while [ ! -f listening ]; do sleep 0; done
$ hg clone http://localhost:$HGPORT/foo copy2
abort: HTTP Error 404: * (glob)
[255]
$ wait $P