ENGCOM-1138: [BACKPORT 2.1] Removed cache backend option which explicitly set file permissions #14417

 - Merge Pull Request #14417 from xtremeperf/magento2:backport_2.1_fix-cache-perms
 - Merged commits:
   1. e577458

Author: magento-engcom-team

lib/internal/Magento/Framework/App/Cache/Frontend/Factory.php

@@ -68,7 +68,6 @@ class Factory
      */
     protected $_backendOptions = [
         'hashed_directory_level' => 1,
-        'hashed_directory_umask' => 0777,
         'file_name_prefix' => 'mage',
     ];