storage: automatically abort old multipart uploads in s3

src/storage/filesystem.js

@@ -14,6 +14,8 @@ exports = module.exports = {
     remove,
     removeDir,
 
+    cleanup,
+
     testConfig,
     removePrivateFields,
     injectPrivateFields
@@ -216,6 +218,11 @@ function validateBackupTarget(folder) {
     return null;
 }
 
+async function cleanup(apiConfig, progressCallback) {
+    assert.strictEqual(typeof apiConfig, 'object');
+    assert.strictEqual(typeof progressCallback, 'function');
+}
+
 async function testConfig(apiConfig) {
     assert.strictEqual(typeof apiConfig, 'object');