Updates to redhat/freeradius.spec

Updated freeradius.spec in the v3.0.x branch work with the current version.  Added build options for rlm_yubikey, rlm_idn, rlm_redis, rlm_rest, rlm_ruby, rlm_sql_freetds, and rlm_sql_oracle.  Optional features can be built by passing build options such as the following.

rpmbuild -bb path/to/freeradius.spec --with rlm_sql_freetds

Tested on CentOS 5 i386 and CentOS 6 x86_64.  Some of the options currently cannot be built because the required packages do not yet exist (ex. rlm_yubikey, rlm_rest).

I am sure this needs additional love.  I was just hoping to get the process started.