Automatic certificate download with ClearPass

To improve the ease of deployment, Aruba switches starting with the 16.08 release allows automatically downloading the root CA certificate of ClearPass servers. As a part of the ZTP, if the configuration of the switch is provided with an additional keyword, the switch will contact ClearPass and download the root CA certificates. This simplifies use cases such as Downloadable User Roles as well as Device Fingerprinting with ClearPass.