Remove FOREIGN

It has been unused since the original import of IBM's code.

Change-Id: Ieec597c76e53453d012f1cd86f6860ae60dade5c
Reviewed-on: http://gerrit.openafs.org/9918
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Benjamin Kaduk <kaduk@mit.edu>