[2.x.x] deserialization now protocol version aware (#2824)

* introduce protocol version to deserialize and read

* thread protocol version through our reader

* example protocol version access in kernel read

* fix our StreamingReader impl (WouldBlock woes)

* debug log progress of txhashset download

servers/src/common/stats.rs

@@ -21,6 +21,7 @@ use std::time::SystemTime;
 
 use crate::core::consensus::graph_weight;
 use crate::core::core::hash::Hash;
+use crate::core::ser::ProtocolVersion;
 
 use chrono::prelude::*;
 
@@ -147,7 +148,7 @@ pub struct PeerStats {
 	/// Address
 	pub addr: String,
 	/// version running
-	pub version: p2p::msg::ProtocolVersion,
+	pub version: ProtocolVersion,
 	/// Peer user agent string.
 	pub user_agent: String,
 	/// difficulty reported by peer

servers/src/grin/server.rs

@@ -39,6 +39,7 @@ use crate::common::stats::{DiffBlock, DiffStats, PeerStats, ServerStateInfo, Ser
 use crate::common::types::{Error, ServerConfig, StratumServerConfig, SyncState, SyncStatus};
 use crate::core::core::hash::{Hashed, ZERO_HASH};
 use crate::core::core::verifier_cache::{LruVerifierCache, VerifierCache};
+use crate::core::ser::ProtocolVersion;
 use crate::core::{consensus, genesis, global, pow};
 use crate::grin::{dandelion_monitor, seed, sync};
 use crate::mining::stratumserver;
@@ -414,9 +415,9 @@ impl Server {
 		self.chain.header_head().map_err(|e| e.into())
 	}
 
-	/// Current p2p layer protocol version.
-	pub fn protocol_version() -> p2p::msg::ProtocolVersion {
-		p2p::msg::ProtocolVersion::default()
+	/// The p2p layer protocol version for this node.
+	pub fn protocol_version() -> ProtocolVersion {
+		ProtocolVersion::default()
 	}
 
 	/// Returns a set of stats about this server. This and the ServerStats