LU-12678 lnet: remove dead code: lnet_fini_locks()

LU-12678 lnet: remove dead code: lnet_fini_locks()

lnet_fini_locks() does nothing and appears to serve
no purpose.  Remove it.
Once long ago it contained some asserts, and there was
a parallel function that was used for user-space builds,
but all that is gone now.

Test-Parameters: trivial testlist=sanity-lnet

Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: I91243b1726694dfe3437a81d15d06330bf96e9c9
Reviewed-on: https://review.whamcloud.com/36838
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Tested-by: jenkins <devops@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>