LU-8191 lnet: convert functions in utils to static

LU-8191 lnet: convert functions in utils to static

Static analysis shows that a number of functions
could be made static. This patch declares several
functions in various LNet utils and lnetconfig to
static.

In LNet selftest (lst), one unused function was
removed entirely. Some declarations were moved to
made static.

Test-Parameters: trivial
Signed-off-by: Timothy Day <timday@amazon.com>
Change-Id: Ia4528281b3c87d77e46abb95f47ab0bdc72168c0
Reviewed-on: https://review.whamcloud.com/c/fs/lustre-release/+/51427
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Arshad Hussain <arshad.hussain@aeoncomputing.com>
Reviewed-by: Neil Brown <neilb@suse.de>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Oleg Drokin <green@whamcloud.com>