LU-17743 ko2iblnd: move to struct lnet_nid

LU-17743 ko2iblnd: move to struct lnet_nid

Move all non wire data structures using lnet_nid_t to
struct lnet_nid. This is the first step to support
IPv6 / GUID.

Test-Parameters: trivial testlist=sanity-lnet
Change-Id: I9d1281a1b7ab7bda566369be2bc5f07ba3ce17f9
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54771
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>