[CentOS-mirror] Remove uidaho mirror

[Jim Kusznir]

Hi all:

I noticed that the uidaho.edu mirror is still listed.  uidaho is just
a few minutes away from us (WSU), and I've spoken to their mirror
manager.  Due to internal problems, they've permanently decommissioned
their mirror server and parted it out.  They're gone, and should be
removed from the list.  If nothing else, their status should be
sufficient to disqualify them...

--Jim