util: Completely remove get_krbrlm

util: Completely remove get_krbrlm

Commit d85ece0977e043154b7d8f5aef5f4cd972771e8e added a new
mechanism for determining whether a realm is local or not, and
susequent commits removed all in-tree calls to the now-legacy
functions in get_krbrlm.c

To avoid confusion, just remove all of these legacy functions, as
we don't want to end up supporting two ways of doing this
operation.

This change is not suitable for pullup to a stable release.

Change-Id: Ie2f5c447f751d12a0d85a4a438efd7e210133e97
Reviewed-on: http://gerrit.openafs.org/7263
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Jeffrey Altman <jaltman@secure-endpoints.com>