SEBA-471 : Include ONU Key in BBSIM logs for OMCI lib, SEBA-472 : Reset Subsequent MibUpload Count in MibReset

Change-Id: Icb53d3baa3ced22b2c11067a65e6d769ad4ea939
diff --git a/omci_common.go b/omci_common.go
index d4d2e35..2a478ce 100644
--- a/omci_common.go
+++ b/omci_common.go
@@ -29,3 +29,7 @@
 type OnuKey struct {
 	IntfId, OnuId uint32
 }
+
+func (k OnuKey) String() string {
+	return fmt.Sprintf("Onu {intfid:%d, onuid:%d}", k.IntfId, k.OnuId)
+}