Ensure NGINX is properly patched

>Draft CIS Benchmark 1.1.14

## Description
Regularly apply latest patch can reduce the security vulnerability.

## Rationale
Attackers may use security vulnerability or exploit specific NGINX.

## Remediation
To apply updates to RHEL / CentOS / Fedora: ``` yum update nginx ``` To apply updates in Debian / Ubuntu: ``` apt-get update nginx ```

## Audit
TBD