VOL-2154: Removed db/model from vendor folder

- Only kept reference to backend structure

Amendments:

- Adjusted imports to voltha-lib-go
- Adjusted vendor version for voltha-lib-go

Change-Id: I7e5ca9f2df7642d18e5a1835e20aa9062a8a3bd1
diff --git a/go.mod b/go.mod
index c5e2ce0..c57d9fa 100644
--- a/go.mod
+++ b/go.mod
@@ -7,7 +7,7 @@
 	github.com/golang/protobuf v1.3.2
 	github.com/onsi/ginkgo v1.8.0 // indirect
 	github.com/onsi/gomega v1.5.0 // indirect
-	github.com/opencord/voltha-lib-go/v2 v2.2.9
+	github.com/opencord/voltha-lib-go/v2 v2.2.10
 	github.com/opencord/voltha-protos/v2 v2.0.1
 	go.etcd.io/etcd v0.0.0-20190930204107-236ac2a90522
 	google.golang.org/grpc v1.24.0