MTA-2996: Make extended_acceptance test suite green

- Fixed NPath complexity
- Updated mtf version

Author: orykh

dev/tests/functional/composer.json

@@ -1,6 +1,6 @@
 {
     "require": {
-        "magento/mtf": "1.0.0-rc40",
+        "magento/mtf": "1.0.0-rc41",
         "php": "~5.5.0|~5.6.0|~7.0.0",
         "phpunit/phpunit": "4.1.0",
         "phpunit/phpunit-selenium": ">=1.2"

dev/tests/functional/tests/app/Magento/Install/Test/Constraint/AssertSuccessInstall.php

@@ -65,6 +65,18 @@ public function processAssert(Install $installPage, InstallConfig $installConfig
         $allData['baseUrl'] = (isset($allData['https']) ? $allData['https'] : $allData['baseUrl']);
         $allData['admin'] = $allData['baseUrl'] . $allData['admin'] . '/';
 
+        $this->checkInstallData($allData, $adminData, $dbData);
+    }
+
+    /**
+     * Check data on success installation page.
+     *
+     * @param array $allData
+     * @param array $adminData
+     * @param array $dbData
+     * @return void
+     */
+    private function checkInstallData(array $allData, array $adminData, array $dbData) {
         foreach ($this->adminFieldsList as $field) {
             \PHPUnit_Framework_Assert::assertEquals(
                 $allData[$field['fixture']],