MAGETWO-36034: Environment variables are messed up for different entry points

- Removed the class as it is not being used by anyone any more.

Author: safwkhan

dev/tests/static/testsuite/Magento/Test/Legacy/_files/obsolete_classes.php

@@ -3333,4 +3333,5 @@
     ['Magento\Log\Model\Shell\Command\Status'],
     ['Magento\Log\Model\LogFactory\Clean'],
     ['Magento\Log\Model\Shell\CommandInterface'],
+    ['Magento\Framework\App\Filesystem\DirectoryList\AbstractShell'],
 ];