LU-10391 lustre: rename class_parse_nid to class_parse_nid4

LU-10391 lustre: rename class_parse_nid to class_parse_nid4

Use the name "nid4" for class_parse_nid(), class_parse_nid_quiet(),
parse_nid() and CLASS_PARSE_NID.  This will allow a new
class_parse_nid which handle larger nids.

Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I2766634ac55ae7bd30c72549decc1cfd99471bfd
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/50088
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: jsimmons <jsimmons@infradead.org>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>