Add repair route

this is specifically for the case where some task failed and user
wants to get it back.

src/routes/apps.js

@@ -12,6 +12,7 @@ exports = module.exports = {
     getLogs: getLogs,
     getLogStream: getLogStream,
     listBackups: listBackups,
+    repairApp: repairApp,
 
     setAccessRestriction: setAccessRestriction,
     setLabel: setLabel,
@@ -361,6 +362,19 @@ function setDataDir(req, res, next) {
     });
 }
 
+function repairApp(req, res, next) {
+    assert.strictEqual(typeof req.body, 'object');
+    assert.strictEqual(typeof req.params.id, 'string');
+
+    debug('Repair app id:%s', req.params.id);
+
+    apps.repair(req.params.id, {}, auditSource.fromRequest(req), function (error, result) {
+        if (error) return next(toHttpError(error));
+
+        next(new HttpSuccess(202, { taskId: result.taskId }));
+    });
+}
+
 function restoreApp(req, res, next) {
     assert.strictEqual(typeof req.body, 'object');
     assert.strictEqual(typeof req.params.id, 'string');