LU-17431 ptlrpc: move nodemap related ioctls to ptlrpc

LU-17431 ptlrpc: move nodemap related ioctls to ptlrpc

Move to ptlrpc the functions designed to handle nodemap specific
ioctls, as they should not be accessible to MGS only.

Test-Parameters: trivial
Signed-off-by: Sebastien Buisson <sbuisson@ddn.com>
Change-Id: I7a9651ea8484c540d18d6813ab96dc95a0871245
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54502
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>