setupWorkerThreads does not work

[Kozzi11]

When I use libevent configuration for vibe-d:core. Everything works ok, but with vibe-core not.

void main()
{
setupWorkerThreads(6);
logInfo("%s", workerThreadCount); // print six with libevent, but zero with vibe-core
runWorkerTaskDist(&runServer);
runApplication();
}

[s-ludwig]

The problem was actually two-fold:

• workerThreadCount wasn't adjusted for the refactored worker task implementation and always returned zero
• setupWorkerThreads always used the number of logical cores instead of the number provided manually.

I'll also add a test for this.