afs_server: delete code that has been ifdef'ed out for years

afs_server: delete code that has been ifdef'ed out for years

The comments in afs_SetServerPrefs() said "clean up, delete this".
The oldest one is a decade old.  Removing these #ifdefs will make
following the rest of the spaghetti #ifdefs a bit easier.

Change-Id: I187ccf2889a5244457218b109404be8b1cf1990e
Reviewed-on: http://gerrit.openafs.org/7911
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>