MAGETWO-65208: Store checksum for every section of configuration file & change behavior on read-only FS & add sorting of importers

Author: Bohdan Korablov

dev/tests/integration/testsuite/Magento/Deploy/Console/Command/App/ApplicationDumpCommandTest.php

@@ -81,14 +81,6 @@ private function loadConfig()
         return $this->reader->load(ConfigFilePool::APP_CONFIG);
     }
 
-    /**
-     * @return array
-     */
-    private function loadEnvConfig()
-    {
-        return $this->reader->load(ConfigFilePool::APP_ENV);
-    }
-
     /**
      * @magentoDbIsolation enabled
      * @magentoDataFixture Magento/Deploy/_files/config_data.php