eth: disable eth/61 to prepare for more elaborate fork sync algos

eth/protocol.go

@@ -37,10 +37,10 @@ const (
 var ProtocolName = "eth"
 
 // Supported versions of the eth protocol (first is primary).
-var ProtocolVersions = []uint{eth63, eth62, eth61}
+var ProtocolVersions = []uint{eth63, eth62}
 
 // Number of implemented message corresponding to different protocol versions.
-var ProtocolLengths = []uint64{17, 8, 9}
+var ProtocolLengths = []uint64{17, 8}
 
 const (
 	NetworkId          = 1