simplify SendMessage

Signed-off-by: Leo Chen <leo@harmony.one>

p2p/host/hostv2/hostv2.go

@@ -1,7 +1,6 @@
 package hostv2
 
 import (
-	"bufio"
 	"context"
 	"fmt"
 
@@ -79,11 +78,9 @@ func (host *HostV2) SendMessage(p p2p.Peer, message []byte) error {
 		return err
 	}
 
-	// Create a buffered stream so that read and writes are non blocking.
-	w := bufio.NewWriter(s)
+	defer s.Close()
+	s.Write(message)
 
-	// Create a thread to read and write data.
-	go writeData(w, message)
 	return nil
 }