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.sum b/go.sum
index e94eb70..082f15b 100644
--- a/go.sum
+++ b/go.sum
@@ -217,8 +217,8 @@
 github.com/onsi/ginkgo v1.6.0/go.mod h1:lLunBs/Ym6LB5Z9jYTR76FiuTmxDTDusOGeTQH+WWjE=
 github.com/onsi/gomega v1.4.2 h1:3mYCb7aPxS/RU7TI1y4rkEn1oKmPRjNJLNEXgw7MH2I=
 github.com/onsi/gomega v1.4.2/go.mod h1:ex+gbHU/CVuBBDIJjb2X0qEXbFg53c61hWP/1CpauHY=
-github.com/opencord/omci-lib-go v0.13.6 h1:T6fyvALAo4Kn2x756S2QhOFFbF/dR939IskZF3gb7O4=
-github.com/opencord/omci-lib-go v0.13.6/go.mod h1:6OIHB14Ch5qGgHzwSWlMACtk5KFoLzQ4LAhdcy4jwvo=
+github.com/opencord/omci-lib-go v0.15.0 h1:ADbDnHOm+XwOZ8CwRY0XmVnFXl/VIdygIdh3iZkbk6E=
+github.com/opencord/omci-lib-go v0.15.0/go.mod h1:6OIHB14Ch5qGgHzwSWlMACtk5KFoLzQ4LAhdcy4jwvo=
 github.com/opencord/voltha-lib-go/v4 v4.0.6 h1:Mc/bkYDR3YcpWPeW35ju9h3sO2cGByz8XM0ik5ikJkc=
 github.com/opencord/voltha-lib-go/v4 v4.0.6/go.mod h1:8NFUZz/mp4OvRmilBRhkLOUrw4G01ruSAVdzQu2ivPc=
 github.com/opencord/voltha-protos/v4 v4.0.8 h1:/P9IYuWPTp/aabS5n1fakQgHCFNzKjW1JHw3TOLAfKE=