replace with custom superagent based on fetch API

src/routes/test/externalldap-test.js

@@ -7,7 +7,7 @@
 
 const common = require('./common.js'),
     expect = require('expect.js'),
-    superagent = require('superagent');
+    superagent = require('../../superagent.js');
 
 describe('External LDAP API', function () {
     const { setup, cleanup, serverUrl, owner } = common;
@@ -23,7 +23,7 @@ describe('External LDAP API', function () {
             const response = await superagent.get(`${serverUrl}/api/v1/external_ldap/config`)
                 .query({ access_token: owner.token });
 
-            expect(response.statusCode).to.equal(200);
+            expect(response.status).to.equal(200);
             expect(response.body).to.eql(defaultConfig);
         });
 
@@ -35,7 +35,7 @@ describe('External LDAP API', function () {
                 .query({ access_token: owner.token })
                 .send(config);
 
-            expect(response.statusCode).to.equal(200);
+            expect(response.status).to.equal(200);
         });
     });
 });