[R4R] Release v1.1.8

[R4R] Release v1.1.9

There is a logic issue which cause "Ethereum peer removal failed, err=peer not registered" occur quite often.

handler.runEthPeer set up a defer removePeer(). This is always called after a peer is disconnected.
However removePeer is also called by mulitple functions like downloader/fetcher.  After those kind of functions removePeer(), peer handler executes defer removePeer(). This makes removePeer() happened twice, and this is the reason we often see "Ethereum peer removal failed, err=peer not registered".

To solve this, removePeer only needs to hard Disconnect peer from networking layer. Then defer unregisterPeer() will do the cleanup task after then.

reference from go-thereum.