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/adaptercore/openolt_flowmgr_test.go b/adaptercore/openolt_flowmgr_test.go
index 12ff83e..6dfb6f3 100644
--- a/adaptercore/openolt_flowmgr_test.go
+++ b/adaptercore/openolt_flowmgr_test.go
@@ -23,7 +23,7 @@
 
 	"github.com/opencord/voltha-protos/v2/go/voltha"
 
-	"github.com/opencord/voltha-lib-go/v2/pkg/db/model"
+	"github.com/opencord/voltha-lib-go/v2/pkg/db"
 	fu "github.com/opencord/voltha-lib-go/v2/pkg/flows"
 	"github.com/opencord/voltha-lib-go/v2/pkg/log"
 	tp "github.com/opencord/voltha-lib-go/v2/pkg/techprofile"
@@ -54,7 +54,7 @@
 	}
 	rsrMgr := resourcemanager.NewResourceMgr("olt", "127.0.0.1:2379", "etcd", "olt", deviceinfo)
 	for key := range rsrMgr.ResourceMgrs {
-		rsrMgr.ResourceMgrs[key].KVStore = &model.Backend{}
+		rsrMgr.ResourceMgrs[key].KVStore = &db.Backend{}
 		rsrMgr.ResourceMgrs[key].KVStore.Client = &mocks.MockKVClient{}
 		rsrMgr.ResourceMgrs[key].TechProfileMgr = mocks.MockTechProfile{TpID: key}
 	}
@@ -65,7 +65,7 @@
 	rsrMgr := newMockResourceMgr()
 	dh := newMockDeviceHandler()
 
-	rsrMgr.KVStore = &model.Backend{}
+	rsrMgr.KVStore = &db.Backend{}
 	rsrMgr.KVStore.Client = &mocks.MockKVClient{}
 
 	dh.resourceMgr = rsrMgr