whisper: revert the special libp2p packet code

handshake now works as it should, no need for custom
protocol messages.

whisper/whisperv6/doc.go

@@ -48,7 +48,6 @@ const (
 	messagesCode         = 1   // normal whisper message
 	powRequirementCode   = 2   // PoW requirement
 	bloomFilterExCode    = 3   // bloom filter exchange
-	lp2pPeerCode         = 125 // libp2p-based peer exchange protocol
 	p2pRequestCode       = 126 // peer-to-peer message, used by Dapp protocol
 	p2pMessageCode       = 127 // peer-to-peer message (to be consumed by the peer, but not forwarded any further)
 	NumberOfMessageCodes = 128

whisper/whisperv6/whisper.go

@@ -724,7 +724,6 @@ func (whisper *Whisper) runMessageLoop(p Peer, rw p2p.MsgReadWriter) error {
 				return errors.New("invalid bloom filter exchange message")
 			}
 			p.setBloomFilter(bloom)
-		case lp2pPeerCode:
 		case p2pMessageCode:
 			// peer-to-peer message, sent directly to peer bypassing PoW checks, etc.
 			// this message is not supposed to be forwarded to other peers, and