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/vendor/github.com/opencord/voltha-lib-go/v2/pkg/techprofile/config.go b/vendor/github.com/opencord/voltha-lib-go/v2/pkg/techprofile/config.go
index 3a45af1..9c64bd8 100644
--- a/vendor/github.com/opencord/voltha-lib-go/v2/pkg/techprofile/config.go
+++ b/vendor/github.com/opencord/voltha-lib-go/v2/pkg/techprofile/config.go
@@ -16,7 +16,7 @@
 package techprofile
 
 import (
-	"github.com/opencord/voltha-lib-go/v2/pkg/db/model"
+	"github.com/opencord/voltha-lib-go/v2/pkg/db"
 )
 
 // tech profile default constants
@@ -83,7 +83,7 @@
 	KVStorePort          int
 	KVStoreType          string
 	KVStoreTimeout       int
-	KVBackend            *model.Backend
+	KVBackend            *db.Backend
 	TPKVPathPrefix       string
 	TPFileKVPath         string
 	TPInstanceKVPath     string