Reconsider banning mechanism

[azarovh]

Having bans in the system has it's own benefits as it quickly reacts and punishes misbehaving nodes thus saves the resources of honest nodes.

On the other hand it is not efficient as banned addresses can be cheaply replaced. Also it can potentially lead to network splits and other negative consequences (such as isolations from Tor network and de-anonymisation).
See chapter V-F in https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=9877811 for Tor related problems.

Since PR 14929 and later PR 19219 bitcoin doesn't ban peer but utilises discouragement. At the moment we can't afford this approach as it implies abundance in nodes.