Drop the non-DA fileserver

The instructions are clearer when we just tell people what
to do, and we think that dafs should be right for almost
everyone.  Mention that the traditional fileserver is an
option and where to read about it, but nothing more.

Change-Id: I1fccceb8ee2bf2ec1e5afb0f5b034f029ee96c61
Reviewed-on: http://gerrit.openafs.org/11577
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: D Brashear <shadow@your-file-system.com>