MAGETWO-69015: Cannot login as admin user with limited user role

- Ported MAGETWO-62648 from 2.1

Author: Alex Paliarush

app/code/Magento/Store/Model/Config/Processor/Fallback.php

@@ -161,17 +161,17 @@ private function prepareStoresConfig(
     }
 
     /**
-     * Retrieve Website Config
+     * Find information about website by its ID.
      *
-     * @param array $websites
+     * @param array $websites Has next format: (website_code => [website_data])
      * @param int $id
      * @return array
      */
     private function getWebsiteConfig(array $websites, $id)
     {
         foreach ((array)$this->websiteData as $website) {
             if ($website['website_id'] == $id) {
-                $code = $website['website_id'];
+                $code = $website['code'];
                 return isset($websites[$code]) ? $websites[$code] : [];
             }
         }

app/code/Magento/Store/Model/ResourceModel/Website.php

@@ -37,17 +37,25 @@ protected function _initUniqueFields()
     }
 
     /**
-     * Read information about all websites
+     * Read all information about websites.
+     *
+     * Convert information to next format:
+     * [website_code => [website_data (website_id, code, name, etc...)]]
      *
      * @return array
      */
     public function readAllWebsites()
     {
+        $websites = [];
         $select = $this->getConnection()
             ->select()
             ->from($this->getTable('store_website'));
 
-        return $this->getConnection()->fetchAll($select);
+        foreach($this->getConnection()->fetchAll($select) as $websiteData) {
+            $websites[$websiteData['code']] = $websiteData;
+        }
+
+        return $websites;
     }
 
     /**

dev/tests/integration/testsuite/Magento/Review/Block/FormTest.php

@@ -0,0 +1,86 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+namespace Magento\Review\Block;
+
+use Magento\Framework\App\Area;
+use Magento\Framework\App\Config\Value;
+use Magento\Framework\App\ReinitableConfig;
+use Magento\Framework\App\State;
+use Magento\TestFramework\ObjectManager;
+
+class FormTest extends \PHPUnit_Framework_TestCase
+{
+    /**
+     * @var ObjectManager;
+     */
+    private $objectManager;
+
+    protected function setUp()
+    {
+        $this->objectManager = $this->getObjectManager();
+
+        parent::setUp();
+    }
+
+    /**
+     * @magentoDbIsolation enabled
+     * @magentoDataFixture Magento/Review/_files/config.php
+     * @dataProvider getCorrectFlagDataProvider
+     */
+    public function testGetCorrectFlag(
+        $path,
+        $scope,
+        $scopeId,
+        $value,
+        $expectedResult
+    ) {
+        /** @var State $appState */
+        $appState = $this->objectManager->get(State::class);
+        $appState->setAreaCode(Area::AREA_FRONTEND);
+
+        /** @var Value $config */
+        $config = $this->objectManager->create(Value::class);
+        $config->setPath($path);
+        $config->setScope($scope);
+        $config->setScopeId($scopeId);
+        $config->setValue($value);
+        $config->save();
+        /** @var ReinitableConfig $reinitableConfig */
+        $reinitableConfig = $this->objectManager->create(ReinitableConfig::class);
+        $reinitableConfig->reinit();
+
+        /** @var \Magento\Review\Block\Form $form */
+        $form = $this->objectManager->create(\Magento\Review\Block\Form::class);
+        $result = $form->getAllowWriteReviewFlag();
+        $this->assertEquals($result, $expectedResult);
+    }
+
+    public function getCorrectFlagDataProvider()
+    {
+        return [
+            [
+                'path' => 'catalog/review/allow_guest',
+                'scope' => 'websites',
+                'scopeId' => '1',
+                'value' => 0,
+                'expectedResult' => false,
+            ],
+            [
+                'path' => 'catalog/review/allow_guest',
+                'scope' => 'websites',
+                'scopeId' => '1',
+                'value' => 1,
+                'expectedResult' => true
+            ]
+        ];
+    }
+
+    private function getObjectManager()
+    {
+        return \Magento\TestFramework\Helper\Bootstrap::getObjectManager();
+    }
+}

dev/tests/integration/testsuite/Magento/Review/_files/config.php

@@ -0,0 +1,15 @@
+<?php
+/**
+ * Copyright © Magento, Inc. All rights reserved.
+ * See COPYING.txt for license details.
+ */
+
+/** @var Value $config */
+use Magento\Framework\App\Config\Value;
+
+$config = \Magento\TestFramework\Helper\Bootstrap::getObjectManager()->create(Value::class);
+$config->setPath('catalog/review/allow_guest');
+$config->setScope('default');
+$config->setScopeId(0);
+$config->setValue(1);
+$config->save();