[hubs] cvsup-master changes

[Garrett Wollman]

<<On Wed, 05 Feb 2014 10:54:06 -0800, Peter Wemm <peter at wemm.org> said:

> I'd appreciate it if folks could turn a critical eye towards their cvsup
> mirror logs and see if they can get a feel for how much this is still being
> used.  If it is the time to consolidate, we have plenty of headroom.

As previously announced, I turned off cvsup services on
xyz.csail.mit.edu last week.  However, cvsup3.freebsd.org still points
to it.

-GAWollman