Generate a CSR for WLC webauthentication

Last week i was instructed to prepare our Wireless LAN Controller to work with
the webauth 3rd party unchained certificate for external visitors.
We want to provide a certain security feeling for the customers, if they combine with us about wlan access.

Background Information

By default, WLCs use a built-in self-signed SSL certificate. The WLCs use this SSL certificate in one of these situations:

You are prompted to accept the certificate from the WLC, because the clients do not have a trusted root certificate for the certificate that is installed on the WLC.
The SSL certificate on the WLC is not in the list of certificates that the client system trusts.
There are two ways to stop the generation of this web-browser security alert popup window.
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