fix 980435

As noted in bug [bug 980435](https://bugzilla.mozilla.org/show_bug.cgi?id=980435) this sets `pidfile` and `lockfile` to the same file. The idea here is to ensure that the lockfile is removed (in this case, by `killproc`) during a "stop".

If this doesn't behave as expected we can try something else. :smile: