[p2p/refactor] move disconnect logic and remove misbehaving
[p2p/refactor] move disconnect logic and remove misbehaving

-Increasing the banscore and/or banning is too harsh,
just disconnecting is enough.
-Return true from ProcessMessage because we already log
receipt of filterclear and disconnect.


Former-commit-id: 843d8e542013786cd8ed5f204389bf9c417ab47c
syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin,syscoin/syscoin