[bugfix] [RHEL/6, RHEL/7] Start using the supercompliance version of accounts umask OVAL check for /etc/login.defs file

Apply new umask template for the case of /etc/login.defs umask OVAL check file.

Tested both on RHEL/6 & RHEL/7, works as expected => moved to shared/, created appropriate RHEL/6 & RHEL/7 links & equipped with test_attestations.

Please review.

Thanks, Jan.