0022801: Rename the ca-cert.pem file when downloaded for a client

Migrated from: https://tracker.clearos.com/view.php?id=22801

Reported by: NHowitt

Currently the CA gets downloaded by the user as ca-cert.pem. If the user were a sysadmin or partner who had OpenVPN access to more than one server then he would need multiple ca-cert.pem files.

In Windows this causes a problem if you put all your ovpn profiles in C:\Program Files\OpenVPN\config (but not if you import them into “%USERPROFILE%\OpenVPN\config” where they go in separate folders).

We could make this much easier by downloading the ca-cert.pem file as something like {server_name}.ca-cert.pem and adjusting the ovpn profile file accordingly.

The issue would be obsoleted if 0017381 (https://tracker.clearos.com/view.php?id=17381) were implemented.