VOL-3847: Support FEC Performance Monitoring History Data L2 PM Counter
VOL-3848: Support GEM Port Network Ctp Performance Monitoring History Data L2 PM Counter

- also re-org code to group common functionality into utility functions

Change-Id: I087125ed4992415dac7b1a6cf84bfe9c1177b469
diff --git a/go.mod b/go.mod
index 2053ee3..cb9b640 100644
--- a/go.mod
+++ b/go.mod
@@ -8,7 +8,7 @@
 	github.com/golang/protobuf v1.4.2
 	github.com/google/gopacket v1.1.17
 	github.com/looplab/fsm v0.1.0
-	github.com/opencord/omci-lib-go v0.13.6
+	github.com/opencord/omci-lib-go v0.15.0
 	github.com/opencord/voltha-lib-go/v4 v4.0.6
 	github.com/opencord/voltha-protos/v4 v4.0.11
 	github.com/stretchr/testify v1.6.1