LU-10391 lustre: introduce class_parse_nid()

LU-10391 lustre: introduce class_parse_nid()

class_parse_nid() and class_parse_nid_quiet() can be used to parse
struct lnet_nid including nids with ipv6 addresses.

Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I82b85f183e91b7b639f58afe5b6c4f90a6b8564c
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50089
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>