LU-10003 lnet: migrate lnet setup and tear down to Netlink

LU-10003 lnet: migrate lnet setup and tear down to Netlink

Migrate the LNet setup and tear down functionality from ioctls to
Netlink. This change now means lnet_ioctl() is no longer needed but
we will keep it for now to support older tools. The work here will
be used in a follow on patch to tell lnet to setup large NIDs by
default for testing.

Test-Parameters: trivial testlist=sanity-lnet
Change-Id: Id69810e114818d423102d6e85ff93529f04c337f
Signed-off-by: James Simmons <jsimmons@infradead.org>
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/54359
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Chris Horn <chris.horn@hpe.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Frank Sehr <fsehr@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>