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/8057Reviewed-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>

drivers/staging/lustre/include/linux/lnet/nidstr.h

@@ -89,6 +89,9 @@ struct netstrfns {
 	int	(*nf_print_addrlist)(char *buffer, int count,
 				     struct list_head *list);
 	int	(*nf_match_addr)(__u32 addr, struct list_head *list);
+	bool	(*nf_is_contiguous)(struct list_head *nidlist);
+	void	(*nf_min_max)(struct list_head *nidlist, __u32 *min_nid,
+			      __u32 *max_nid);
 };
 
 #endif /* _LNET_NIDSTRINGS_H */