storage: make remount async

src/backups.js

@@ -67,12 +67,6 @@ const COLLECTD_CONFIG_EJS = fs.readFileSync(__dirname + '/collectd/cloudron-back
 
 const BACKUPS_FIELDS = [ 'id', 'remotePath', 'label', 'identifier', 'creationTime', 'packageVersion', 'type', 'dependsOnJson', 'state', 'manifestJson', 'format', 'preserveSecs', 'encryptionVersion' ];
 
-// helper until all storage providers have been ported
-function maybePromisify(func) {
-    if (util.types.isAsyncFunction(func)) return func;
-    return util.promisify(func);
-}
-
 function postProcess(result) {
     assert.strictEqual(typeof result, 'object');
 
@@ -385,5 +379,5 @@ async function remount(auditSource) {
     const func = storage.api(backupConfig.provider);
     if (!func) throw new BoxError(BoxError.BAD_FIELD, 'unknown storage provider');
 
-    await maybePromisify(storage.api(backupConfig.provider).remount)(backupConfig);
+    await storage.api(backupConfig.provider).remount(backupConfig);
 }