FreeRADIUS: The world's most popular RADIUS Server

This is my opinionated build of FreeRADIUS for the platforms I care about, based on the v3.0.x git tree.

EPEL is required.

Extra features enabled compared to the standard RHEL release:
* Redis (via hiredis)
* High performance AD integration (via libwbclient)
* ABFAb (via trust_router-libs)
* Yubikey cloud (via libyubikey/ykclient)
* Memcached backend for session caching
* EAP-FAST