rust-dirstate-status: add call to rust-fast path for `dirstate.status`
The reasoning behind this patch is explained in the first patch of the series.
Differential Revision: https://phab.mercurial-scm.org/D7060
#require serve
$ hg clone http://localhost:$HGPORT/ copy
abort: * (glob)
[255]
$ test -d copy
[1]
$ "$PYTHON" "$TESTDIR/dumbhttp.py" -p $HGPORT --pid dumb.pid
$ cat dumb.pid >> $DAEMON_PIDS
$ hg clone http://localhost:$HGPORT/foo copy2
abort: HTTP Error 404: * (glob)
[255]
$ killdaemons.py