server: Use server peer in log statements.

This change a few cases that log the peer to use the server peer instead
of the underlying peer from the peer package.  This doesn't change the
output in any way, but it is more consistent with the vast majority of
other instances.  It also preferable since it ensures consistent logging
output if a custom stringer is ever implemented on server peers.

server.go

@@ -656,7 +656,7 @@ func (sp *serverPeer) pushAddrMsg(addresses []*addrmgr.NetAddress) {
 	}
 	known, err := sp.PushAddrMsg(addrs)
 	if err != nil {
-		peerLog.Errorf("Can't push address message to %s: %v", sp.Peer, err)
+		peerLog.Errorf("Can't push address message to %s: %v", sp, err)
 		sp.Disconnect()
 		return
 	}
@@ -739,7 +739,7 @@ func (sp *serverPeer) OnVersion(_ *peer.Peer, msg *wire.MsgVersion) {
 	// Reject peers that have a protocol version that is too old.
 	if msg.ProtocolVersion < int32(wire.SendHeadersVersion) {
 		srvrLog.Debugf("Rejecting peer %s with protocol version %d prior to "+
-			"the required version %d", sp.Peer, msg.ProtocolVersion,
+			"the required version %d", sp, msg.ProtocolVersion,
 			wire.SendHeadersVersion)
 		sp.Disconnect()
 		return
@@ -750,8 +750,7 @@ func (sp *serverPeer) OnVersion(_ *peer.Peer, msg *wire.MsgVersion) {
 	if !isInbound && !hasServices(msg.Services, wantServices) {
 		missingServices := wantServices & ^msg.Services
 		srvrLog.Debugf("Rejecting peer %s with services %v due to not "+
-			"providing desired services %v", sp.Peer, msg.Services,
-			missingServices)
+			"providing desired services %v", sp, msg.Services, missingServices)
 		sp.Disconnect()
 		return
 	}
@@ -874,7 +873,7 @@ func (sp *serverPeer) pushMiningStateMsg(height uint32, blockHashes []chainhash.
 // mined on and pushes a miningstate wire message back to the requesting peer.
 func (sp *serverPeer) OnGetMiningState(_ *peer.Peer, msg *wire.MsgGetMiningState) {
 	if sp.getMiningStateSent {
-		peerLog.Tracef("Ignoring getminingstate from %v - already sent", sp.Peer)
+		peerLog.Tracef("Ignoring getminingstate from %v - already sent", sp)
 		return
 	}
 	sp.getMiningStateSent = true
@@ -961,7 +960,7 @@ func (sp *serverPeer) OnMiningState(_ *peer.Peer, msg *wire.MsgMiningState) {
 // It sends the available requested info to the remote peer.
 func (sp *serverPeer) OnGetInitState(_ *peer.Peer, msg *wire.MsgGetInitState) {
 	if sp.initStateSent {
-		peerLog.Tracef("Ignoring getinitstate from %v - already sent", sp.Peer)
+		peerLog.Tracef("Ignoring getinitstate from %v - already sent", sp)
 		return
 	}
 	sp.initStateSent = true
@@ -1264,8 +1263,7 @@ func (sp *serverPeer) OnGetHeaders(_ *peer.Peer, msg *wire.MsgGetHeaders) {
 	workSum, err := chain.ChainWork(&tipHash)
 	if err == nil && workSum.Lt(&sp.server.minKnownWork) {
 		srvrLog.Debugf("Sending empty headers to peer %s in response to "+
-			"getheaders due to local best known tip having too little work",
-			sp.Peer)
+			"getheaders due to local best known tip having too little work", sp)
 		sp.QueueMessage(&wire.MsgHeaders{}, nil)
 		return
 	}
@@ -1373,7 +1371,7 @@ func (sp *serverPeer) OnGetAddr(_ *peer.Peer, msg *wire.MsgGetAddr) {
 	// Only respond with addresses once per connection.  This helps reduce
 	// traffic and further reduces fingerprinting attacks.
 	if sp.addrsSent {
-		peerLog.Tracef("Ignoring getaddr from %v - already sent", sp.Peer)
+		peerLog.Tracef("Ignoring getaddr from %v - already sent", sp)
 		return
 	}
 	sp.addrsSent = true