CLDSRV-179 - update imports

All file-related metadata/bucket file interfaces in `storage` have moved
under the `file` key.

Author: Jordi Bertran de Balanda

lib/metadata/bucketfile/backend.js

@@ -7,7 +7,7 @@ const constants = require('../../../constants');
 const { config } = require('../../Config');
 
 const errors = arsenal.errors;
-const MetadataFileClient = arsenal.storage.metadata.MetadataFileClient;
+const MetadataFileClient = arsenal.storage.metadata.file.MetadataFileClient;
 const versionSep = arsenal.versioning.VersioningConstants.VersionId.Separator;
 
 const METASTORE = '__metastore';

mdserver.js

@@ -2,7 +2,7 @@
 
 const { config } = require('./lib/Config.js');
 const MetadataFileServer =
-          require('arsenal').storage.metadata.MetadataFileServer;
+          require('arsenal').storage.metadata.file.MetadataFileServer;
 const logger = require('./lib/utilities/logger');
 
 process.on('uncaughtException', err => {