#2 Finding neighbors not sufficient

[Stefan Kraxberger]

We are currently use the NeighborRequest to keep the connections with known neighbors alive or create them. We don't discover any new peers through this mechanism.

We only add a neighbor if we have a direct connection with them which. This is the case if one peer has another peer specified as neighbor in the configuration but the other one not.

We should find a way to obtain new neighbors depending on the network topology and size.