sdxo#4541: Now, Moodle has 100% transparent-authentication.

Earlier, a "meaningless" login-screen was shown, in case the user had not registered.
Now, a simple message is shown, asking the user to register first.

Signed-off-by: Ajay Garg <ajay@activitycentral.com>
Replacing "schoolserver.local" with their corresponding variables.

Thanks a ton to Santi and Miguel !!
Moving the "ServerName" directive configuration to httpd.yml, as it is
in general good to specify it across the system.

Thanks to Miguel and Santi for the motivation.
Merge branch 'ajaygarg84:sdxo4541-sandwitch-authentication'

sdxo#4541: Now, Moodle has 100% transparent-authentication.