implement mitigation for CVE-2019-11043
This merge request implements the recommended mitigation for CVE-2019-11043 explained in https://nextcloud.com/blog/urgent-security-issue-in-nginx-php-fpm/
This merge request implements the recommended mitigation for CVE-2019-11043 explained in https://nextcloud.com/blog/urgent-security-issue-in-nginx-php-fpm/