VOL-2189 update voltha-lib-go to use voltha-protos=v2.0.0;
Release 2.2.9

Change-Id: I4421bc86324c692e71494cb09ba1ddc5454c1054
diff --git a/pkg/pmmetrics/performance_metrics.go b/pkg/pmmetrics/performance_metrics.go
index 4bd0446..8951a7d 100644
--- a/pkg/pmmetrics/performance_metrics.go
+++ b/pkg/pmmetrics/performance_metrics.go
@@ -17,7 +17,7 @@
 package pmmetrics
 
 import (
-	"github.com/opencord/voltha-protos/go/voltha"
+	"github.com/opencord/voltha-protos/v2/go/voltha"
 )
 
 // PmMetrics structure holds metric and device info