Add TLS support to Nginx script

[Shwetajain148]

• By default, the script will send the apache logs securely on port 6514
• If the users give --insecure in the command then he/she can switch to insecure sending.
• For system logs, the script will give a prompt to send them securely. If user gives input in "Yes" then the script will download the certificate and "rsyslog-gnutls" package and will change the 22-loggly.conf content to the secured one.