Adds a no-op migration for metadata v3

Signed-off-by: John Howard <jhoward@microsoft.com>

metadata/migrations.go

@@ -45,6 +45,11 @@ var migrations = []migration{
 		version: 2,
 		migrate: migrateIngests,
 	},
+	{
+		schema:  "v1",
+		version: 3,
+		migrate: noOpMigration,
+	},
 }
 
 // addChildLinks Adds children key to the snapshotters to enforce snapshot
@@ -154,3 +159,10 @@ func migrateIngests(tx *bolt.Tx) error {
 
 	return nil
 }
+
+// noOpMigration was for a database change from boltdb/bolt which is no
+// longer being supported, to go.etcd.io/bbolt which is the currently
+// maintained repo for boltdb.
+func noOpMigration(tx *bolt.Tx) error {
+	return nil
+}