backups: move mount status to separate route

src/routes/backups.js

@@ -6,6 +6,7 @@ exports = module.exports = {
     create,
     cleanup,
     remount,
+    getMountStatus
 };
 
 const assert = require('assert'),
@@ -63,3 +64,9 @@ async function remount(req, res, next) {
 
     next(new HttpSuccess(202, {}));
 }
+
+async function getMountStatus(req, res, next) {
+    const [error, mountStatus] = await safe(backups.getMountStatus());
+    if (error) return next(BoxError.toHttpError(error));
+    next(new HttpSuccess(200, mountStatus));
+}