Solve unbound network layer queues

[kwek20]

Bug description

in #1833 we changed the network layer to use an unbound queue, which leads to increased memory footprint and reduced syncing speed.

It did however solve some issues regarding #1742

We should find a proper solution and revert the queues back to a bound version

Open question: Should we stick to 100, or change the number?

[GalRogozinski]

The problem is that we enter a deadlock... we shouldn't enter a deadlock