LU-18986 mgc: client part of new registration protocol

LU-18986 mgc: client part of new registration protocol

Use new target registration protocol in MGC.
It uses inline buffer mtn_inline_list[] if NIDs fit into
it or prepare bulk transfer for large list of NIDs.

Test-Parameters: testlist=runtests mdsversion=EXA6.3.2
Test-Parameters: testlist=runtests ossversion=EXA6.3.2
Test-Parameters: testlist=runtests serverversion=EXA6.3.2
Test-Parameters: testlist=runtests clientversion=EXA6.3.2
Signed-off-by: Mikhail Pershin <mpershin@whamcloud.com>
Change-Id: Ifc0fd24d7eb26dd092c3e9cce895980b26f0524d
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/59212
Tested-by: Maloo <maloo@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>