VOL-2861 replace uint64 kafka interadapter timestamps with timestamp proto

Change-Id: Ib7de52ce7a663b4817e383f03f34e4398d6c980d
diff --git a/pkg/adapters/common/adapter_proxy.go b/pkg/adapters/common/adapter_proxy.go
index bbae0ed..cd5750f 100644
--- a/pkg/adapters/common/adapter_proxy.go
+++ b/pkg/adapters/common/adapter_proxy.go
@@ -18,7 +18,6 @@
 import (
 	"context"
 	"github.com/opencord/voltha-lib-go/v3/pkg/db"
-	"time"
 
 	"github.com/golang/protobuf/proto"
 	"github.com/golang/protobuf/ptypes"
@@ -79,7 +78,7 @@
 	} else {
 		header.Id = uuid.New().String()
 	}
-	header.Timestamp = time.Now().Unix()
+	header.Timestamp = ptypes.TimestampNow()
 	iaMsg := &ic.InterAdapterMessage{
 		Header: header,
 		Body:   marshalledMsg,