[LAWS] Attempt to steal from all other workers instead of just one
The LAWS strategy, unlike the WS strategy, previously only attempted to steal from one victim, instead of trying all other workers. This probably caused SimpleActorTest to sporadically timeout, as all workers went to sleep.
With this change, LAWS attempts, just like WS, to steal from all other workers. In a next step, we may want to reduce the duplicated code resulting from this.
Fixes #6 (closed).