staging: lustre: add in NID range management for libcfs

staging: lustre: add in NID range management for libcfs

This is a partial backport of the NID range management
added in for nodemap. We only backport the libcfs related
parts here.

Signed-off-by: Joshua Walgenbach <jjw@iu.edu>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3527
Reviewed-on: http://review.whamcloud.com/8057
Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Andrew Perepechko <andrew_perepechko@xyratex.com>
Reviewed-by: John L. Hammond <john.hammond@intel.com>
Reviewed-by: Ken Hornstein <kenh@cmf.nrl.navy.mil>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>