VOL-1848 Print affinity router frames in hex, not decimal

Change-Id: Ie2d2ff92f078f640288724fa60a4525c2611f538
diff --git a/afrouter/afrouter/streams.go b/afrouter/afrouter/streams.go
index 458ed06..bb7faea 100644
--- a/afrouter/afrouter/streams.go
+++ b/afrouter/afrouter/streams.go
@@ -18,6 +18,7 @@
 
 import (
 	"context"
+	"encoding/hex"
 	"errors"
 	"github.com/opencord/voltha-go/common/log"
 	"google.golang.org/grpc"
@@ -118,7 +119,7 @@
 					break
 				}
 			}
-			log.Debugf("Northbound frame %v", f.payload)
+			log.Debugf("Northbound frame %s", hex.EncodeToString(f.payload))
 			if err := dst.SendMsg(f); err != nil {
 				srcS.c2sReturn <- err
 				break
@@ -208,7 +209,7 @@
 				log.Debugf("SendAll failed %s", err.Error())
 				break
 			}
-			log.Debugf("Southbound frame %v", f.payload)
+			log.Debugf("Southbound frame %s", hex.EncodeToString(f.payload))
 			if err := src.RecvMsg(f); err != nil {
 				ret <- err // this can be io.EOF which is happy case
 				break