Trond.Myklebust@netapp.com> 1329283191 -0500

NFSv4: Further reduce the footprint of the idmapper

Don't allocate the legacy idmapper tables until we actually need
them.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Reviewed-by: Jeff Layton <jlayton@redhat.com>