LU-9679 lnet: discard lnet_print_text_bufs()

lnet_print_text_bufs() is unused and has
never been used since it was introduced in
Commit ed88907a96ba ("Landing b_hd_newconfig on HEAD")
So let's remove it.

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: Ic412cdef4981a043e94060e5de5646b836bb0e36
Reviewed-on: https://review.whamcloud.com/36659
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Chris Horn <hornc@cray.com>
Reviewed-by: Serguei Smirnov <ssmirnov@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>