VOL-2154 : Moving back db/model to voltha-go

- Kept backend.go to limit impact in other components

Amendments:

- Removed db/model unit tests
- Forgot to fix some stash merges
- Removed unused "lock" parameter from kv clients
- Changed version for release

Change-Id: I25a03eb335ce22d49412be4bf2cceaff387dc4ae
diff --git a/pkg/techprofile/config.go b/pkg/techprofile/config.go
index 3a45af1..9c64bd8 100644
--- a/pkg/techprofile/config.go
+++ b/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