LU-12477 lnet: Remove obsolete config options

Remove a few obselete config options, some for kernels we
no longer support, some for configs that should be unused.

Test-Parameters: trivial

Signed-off-by: Patrick Farrell <pfarrell@whamcloud.com>
Change-Id: Icb949b1dd69e5cac0278965dfc5b8e3d1120f153
Reviewed-on: https://review.whamcloud.com/35343
Reviewed-by: Shaun Tancheff <stancheff@cray.com>
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>