Dispatch the offers after contact not as in the paper

[Chat-Wane]

Currently, one offer is dispatched per neighbour in the partialView of the contact peer. However, there are normally more offers to dispatch in order to handle failures. Each offer should be eventually accepted, but when the global network is small, some subscription can loop in the network without beeing accepted because the peers already knows the subscribing peer.

In the paper, a peer discards the subscription request when it forwarded it 10 times.