When disconnecting a node, clear the received buffer so that we do not process any already received messages.
When disconnecting a node, clear the received buffer so that we do
not process any already received messages.

The primary reason to do this is if a node spams hundreds of messages
and we ban them, we don't want to continue processing the rest of it.

MidasPaymentLTD/midascoin,MidasPaymentLTD/midascoin,MidasPaymentLTD/midascoin,MidasPaymentLTD/midascoin,MidasPaymentLTD/midascoin