backup: rename back backuplisting.js to backups.js

this was a transitional rename till I figured out how to split
it in backuptargets.js

src/test/archives-test.js

@@ -6,7 +6,7 @@
 'use strict';
 
 const archives = require('../archives.js'),
-    backupListing = require('../backuplisting.js'),
+    backups = require('../backups.js'),
     BoxError = require('../boxerror.js'),
     common = require('./common.js'),
     expect = require('expect.js'),
@@ -20,8 +20,8 @@ describe('Archives', function () {
         remotePath: 'backup-box',
         encryptionVersion: 2,
         packageVersion: '1.0.0',
-        type: backupListing.BACKUP_TYPE_APP,
-        state: backupListing.BACKUP_STATE_NORMAL,
+        type: backups.BACKUP_TYPE_APP,
+        state: backups.BACKUP_STATE_NORMAL,
         identifier: 'box',
         dependsOn: [ 'dep1' ],
         manifest: null,
@@ -32,7 +32,7 @@ describe('Archives', function () {
 
     before(async function () {
         await setup();
-        appBackup.id = await backupListing.add(appBackup);
+        appBackup.id = await backups.add(appBackup);
     });
     after(cleanup);