gRPC migration

Change-Id: I3129ae27d7ee12a23c7046f0d877e8064f2fd7f4
diff --git a/go.mod b/go.mod
index 57ec840..eef1c2d 100644
--- a/go.mod
+++ b/go.mod
@@ -2,10 +2,16 @@
 
 go 1.16
 
+replace (
+	github.com/coreos/bbolt v1.3.4 => go.etcd.io/bbolt v1.3.4
+	go.etcd.io/bbolt v1.3.4 => github.com/coreos/bbolt v1.3.4
+	google.golang.org/grpc => google.golang.org/grpc v1.25.1
+)
+
 require (
 	github.com/gorilla/mux v1.8.0
 	github.com/imdario/mergo v0.3.11 // indirect
-	github.com/opencord/voltha-lib-go/v4 v4.2.3
+	github.com/opencord/voltha-lib-go/v7 v7.0.0
 	gotest.tools v2.2.0+incompatible
 	k8s.io/api v0.19.0
 	k8s.io/apimachinery v0.19.0