(#6814) - Add support to store cookies on Node.js

* (#6814) - Add support to store cookies on Node.js

On Node.js, PouchDB does not hold a cookie jar for cookies received
from server during authentication. It uses the request Node.js module
to make HTTP requests but it does not configure it correctly to hold
a cookie jar.

This adds the minimal required configuration for the request module.

* (#6814) - Add a test for support for cookies on Node.js

* (#6814) - Fix and move test for support for cookies on Node.js

packages/node_modules/pouchdb-ajax/src/request.js

@@ -1,3 +1,5 @@
 // May seem redundant, but this is to allow switching with
 // request-browser.js.
-export default require('request');
+export default require('request').defaults({
+  jar: true
+});

tests/component/test.ajax.js

@@ -0,0 +1,39 @@
+'use strict';
+
+var http = require('http');
+var PouchDB = require('../../packages/node_modules/pouchdb-for-coverage');
+var should = require("chai").should();
+
+describe('test.ajax.js', function () {
+
+  it('#6815 ajax uses cookies', function (done) {
+    var server = http.createServer(function (req, res) {
+      if (req.url === '/install-cookie') {
+        res.writeHead(200, {'Set-Cookie': 'Test=test; Version=1; Path=/; HttpOnly'});
+        res.end(JSON.stringify({ok: true}));
+      } else if (req.url === '/check-cookie') {
+        res.end(JSON.stringify({ok: req.headers.cookie === 'Test=test'}));
+      }
+    });
+    server.listen(6000, function () {
+      PouchDB.ajax({
+        method: 'GET',
+        url: 'http://127.0.0.1:6000/install-cookie',
+        timeout: 10
+      }, function (err, res) {
+        should.equal(res.ok, true, "Server not responding");
+
+        PouchDB.ajax({
+          method: 'GET',
+          url: 'http://127.0.0.1:6000/check-cookie',
+          timeout: 10
+        }, function (err, res) {
+          server.close();
+
+          should.equal(res.ok, true, "Cookie not set");
+          done();
+        });
+      });
+    });
+  });
+});