audit: remove static local realms

audit: remove static local realms

Remove the static list of local realms and use the
auth interace to do the local realm check. A callback
function is registered by the servers to avoid a circular
dependency between audit and auth.

Change-Id: Ic0f25cd79da7987704de68bade14054490b26c80
Reviewed-on: http://gerrit.openafs.org/6879
Tested-by: BuildBot <buildbot@rampaginggeek.com>
Reviewed-by: Derrick Brashear <shadow@dementix.org>