VOL-3978 - update to go 1.16.3

- lint required re-format of "generaged" files
- tidied up go.mod

Change-Id: I8fbab94b679061a5e9ba05f95a33b2bb4ca9edc4
diff --git a/layers.go b/layers.go
index 6eb09a9..1bac6b3 100644
--- a/layers.go
+++ b/layers.go
@@ -19,8 +19,8 @@
 
 import (
 	"errors"
-	me "github.com/opencord/omci-lib-go/generated"
 	"github.com/google/gopacket"
+	me "github.com/opencord/omci-lib-go/generated"
 )
 
 var nextLayerMapping map[MessageType]gopacket.LayerType