Implement eth/66 (#467)

* Allow eth/66

* Add eth/66 request ids

* fmt

* Remove some leftovers

* fmt

* Change behaviour in case of missing peer info

- Assume eth/66 protocol, not earlier one
- Log just a trace, not an error

crates/ethcore/sync/src/tests/helpers.rs

@@ -18,7 +18,7 @@ use api::PAR_PROTOCOL;
 use bytes::Bytes;
 use chain::{
     sync_packet::{PacketInfo, SyncPacket},
-    ChainSync, ForkFilterApi, SyncSupplier, ETH_PROTOCOL_VERSION_65, PAR_PROTOCOL_VERSION_2,
+    ChainSync, ForkFilterApi, SyncSupplier, ETH_PROTOCOL_VERSION_66, PAR_PROTOCOL_VERSION_2,
 };
 use ethcore::{
     client::{
@@ -172,7 +172,7 @@ where
         if protocol == PAR_PROTOCOL {
             PAR_PROTOCOL_VERSION_2.0
         } else {
-            ETH_PROTOCOL_VERSION_65.0
+            ETH_PROTOCOL_VERSION_66.0
         }
     }